Irish Baby Names
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| Name | Meaning | Gender | Origin |
| Addergoole | From between two fords. | M | Irish baby names |
| Adeen | Little fire. | F | Irish |
| Aderrig | From the red ford. | M | Irish |
| Adhamhnan | Variant of Adamnan: Little Adam. | M | Irish baby names |
| Aeary | Scholar. | M | Irish |
| Aedus | Fire. | M | Irish |
| Aghy | Friend of horses. | M | Irish baby names |
| Anntoin | Priceless. | M | Irish |
| Ardkill | From the high church. | M | Irish |
| Baethan | Foolish. | M | Irish baby names |
| Baibre | Strange. | F | Irish |
| Bailintin | Valiant. | M | Irish |
| Bainbridge | fair bridge | M | Irish baby names |
| Bairrfhoinn | Handsome. | M | Irish |
| Banbhan | Piglet. | M | Irish |
| Banning | small and fair | M | Irish baby names |
| Baothghalach | Foolish pride. | M | Irish |
| Barrie | spear; markswoman; a feminine form of Barry | F | Irish |
| Bayerd | Variant of Baird: Bard; travelling musician/singer. | M | Irish baby names |
| Bayrd | Variant of Baird: Bard; travelling musician/singer. | M | Irish |
| Beag | Variant of Beacan: Small. | M | Irish |
| Beamard | Brave as a bear. | M | Irish baby names |
| Beanon | Good. | M | Irish |
| Bearchan | Variant of Bearach: Spearlike. | M | Irish |
| Bec | Diminutive of Beacan: Small. | M | Irish baby names |
| Behellagh | Variant of Baothghalach: Foolish pride. | M | Irish |
| Beinean | Variant of Beanon: Good. | M | Irish |
| Beineon | Variant of Beanon: Good. | M | Irish baby names |
| Beircheart | Shining army. | M | Irish |
| Benen | Kind. | M | Irish |
| Beolagh | Foolish pride. | M | Irish baby names |
| Bercnan | Variant of Bearach: Spearlike. | M | Irish |
| Bergin | Variant of Bearach: Spearlike. | M | Irish |
| Biddy | Diminutive of Brigid: A variant of Bridget/ meaning the high one or strength. Famous bearer: 6th century Irish abbess Brigid )known as St Bridget or St Bride) founded Ireland's first women's religious community. | F | Irish baby names |
| Bidina | Protective. | F | Irish |
| Blyana | Strong. | F | Irish |
| Boetius | Foolish pride. | M | Irish baby names |
| Bohannon | Son of Owen. | M | Irish |
| Boine | Variant of Boyne: White cow. | M | Irish |
| Brea | Hill. Also variant of Brina and Breanna. | F | Irish baby names |
| Breck | freckled | M | Irish |
| Brenn | Prince. Variant of Brendan. | M | Irish |
| Bresal | Pain. Also a variant of Brasil: War. | M | Irish baby names |
| Breslin | Surname. | M | Irish |
| Bria | Hill. Also variant of Brina and Breanna. | F | Irish |
| Buach | Victorious. | M | Irish baby names |
| Buadhach | Victory. | M | Irish |
| Buagh | Victorious. | M | Irish |
| Buan | Goodness. | F | Irish baby names |
| Cacanisius | Son of Nis. | M | Irish |
| Cace | Variant of Casey: Observant; alert; vigorous. | M | Irish |
| Caffar | Helmet. | M | Irish baby names |
| Caffara | Helmet. | F | Irish |
| Caffaria | Helmet. | F | Irish |
| Cagney | Surname. | M | Irish baby names |
| Cahir | Warrior. | M | Irish |
| Cahira | Warrior. | F | Irish |
| Caitie | Variant of Katherine meaning pure. | F | Irish baby names |
| Caitlan | Variant of Katherine meaning pure. | F | Irish |
| Caitland | Variant of Katherine meaning pure. | F | Irish |
| Calbhach | Bald. | M | Irish baby names |
| Calin | Variant of Caelan: Powerful warrior. | M | Irish |
| Callaghan | Strife. Saint Callaghan was an Irish saint. | M | Irish |
| Callahan | Surname. | M | Irish baby names |
| Callough | Bald. | M | Irish |
| Camy | Variant of Camey: Champion. | M | Irish |
| Canice | Good-looking; handsome. | M | Irish baby names |
| Caoimhe | Lovely and charming. | F | Irish |
| Caoimhin | Noble. | M | Irish |
| Caomh | Lovable. | M | Irish baby names |
| Caraid | Friend. | F | Irish |
| Carrick | rock | M | Irish |
| Cartagh | Variant of Carthach: Loving. A variant of Caradoc. The Irish St. Carthach/ also known as St Carthage/ founded an early 7th century monastery at Lismore/ County Waterford. | M | Irish |
| Carthach | Loving. A variant of Caradoc. The Irish St. Carthach/ also known as St Carthage/ founded an early 7th century monastery at Lismore/ County Waterford. | M | Irish |
| Caulan | Variant of Caelan: Powerful warrior. | M | Irish |
| Cavana | From Cavan. | F | Irish |
| Ceallachan | Variant of Ceallach: War; strife. | M | Irish |
| Cianan | Variant of Cian: Old; ancient; archaic. | M | Irish |
| Ciar | Saint. | F | Irish |
| Ciardha | Variant of Ciaran: Black-haired. | M | Irish |
| Ciarrai | County. Variant of Ciaran: Black-haired. | M | Irish |
| Ciatlllait | Archaic. | F | Irish |
| Cinneide | Variant of Cinneidid: Helmeted; helmed head. | M | Irish |
| Cinneidid | Helmet head; helmed head. | M | Irish |
| Cinneidigh | Variant of Cinneidid: Helmeted; helmed head. | M | Irish |
| Clancy | red-headed fighter | M | Irish |
| Cleary | learned | M | Irish |
| Clodagh | From the name of an Irish river/ Clodagh is used occasionally as a first name in Ireland. | F | Irish |
| Cluny | meadow | M | Irish |
| Cochlain | Hooded. | M | Irish |
| Coillcumhann | From the narrow forest. | M | Irish |
| Colhoun | Variant of Calhoun: Small forest. | M | Irish |
| Coman | Bent. | M | Irish |
| Comdhan | Variant of Comhghan: Twin. | M | Irish |
| Comhghall | Hostage. | M | Irish |
| Conall | high/ mighty | M | Irish |
| Corran | Spear-bearer. | M | Irish |
| Correen | Maiden. | F | Irish |
| Correena | Maiden. | F | Irish |
| Corrianne | Variant of Cory meaning variously: from the round hill; seething pool; ravine. | F | Irish |
| Corrigan | spearman | M | Irish |
| Corrin | spear carrier | M | Irish |
| Creedon | A surname meaning 'Belief; guiding principle.'. | M | Irish |
| Crogher | Loves hounds. | M | Irish |
| Crohoore | Loves hounds. | M | Irish |
| Cronan | Little dark one. | M | Irish |
| Cuanaic | Handsome. | M | Irish |
| CuUladh | Hound of Ulster. | M | Irish |
| Dahy | Capable; quick and agile. | M | Irish |
| Daibheid | Dearly loved. | M | Irish |
| Daibhid | Variant of Daibhidh: Beloved. | M | Irish |
| Dailey | Variant of Daly: Gather together. | M | Irish |
| Daithi | Beloved or quick and agile. | M | Irish |
| Daithm | Variant of Daibhidh: Beloved. | M | Irish |
| Dalon | Variant of Dallin 'blind.'. | M | Irish |
| Daran | an alternate form of Darren | M | Irish |
| Daron | great; a feminine form of Darren | F | Irish |
| Deoradhain | Exile. | M | Irish |
| Derforgal | Servant of Dervor. | F | Irish |
| Derforgala | Servant of Dervor. | F | Irish |
| Dermod | Variant of Dermot: Free from jealosy. | M | Irish |
| Devaney | Dark-haired. | F | Irish |
| Devanie | Dark-haired. | F | Irish |
| Devenny | Dark-haired. | F | Irish |
| Devent | Bard. | F | Irish |
| Devland | Misfortune. | M | Irish |
| Devlen | Variant of Devlin: Brave. | M | Irish |
| Devlon | Misfortune. | M | Irish |
| Devlyn | Variant of Devlin: Brave; misfortune. | M | Irish |
| Devnet | Bard. | F | Irish |
| Digby | ditch town; dike town | M | Irish |
| Dinsmore | fortified hill | M | Irish |
| Doherty | harmful | M | Irish |
| Donahue | dark warrior | M | Irish |
| Dow | dark-haired | M | Irish |
| Duvessa | Dark beauty. | F | Irish |
| Duwayne | Dark. Many Irish and Scottish names have the meaning 'dark' or 'black.'. | M | Irish |
| Dwain | Dark. Many Irish and Scottish names have the meaning 'dark' or 'black.'. | M | Irish |
| Dwyer | Dark wisdom. | M | Irish |
| Eadbard | Variant of Eadbhard: Rich protector. | M | Irish |
| Eadbhard | Rich protector. | M | Irish |
| Eagan | very mighty | M | Irish |
| Ealga | Noble. | F | Irish |
| Eames | Prosperous protector.' Variant of Edmund. | M | Irish |
| Eistir | Irish form of Esther: star. | F | Irish |
| Eithna | Feminine form of Aidan: fire. | F | Irish |
| Erc | Red. | M | Irish |
| Etney | Feminine form of Aidan: fire. | F | Irish |
| Euan | Possibly a variant of John. | M | Irish |
| Euston | Heart. | M | Irish |
| Evoy | Blond. | M | Irish |
| Fachnan | Name of a saint. | M | Irish |
| Fagan | little fiery one | M | Irish |
| Fahey | From the green field. | M | Irish |
| Fahy | From the green field. | M | Irish |
| FaIIon | Ruler. | M | Irish |
| Fainche | Free. | F | Irish |
| Faline | In charge. | F | Irish |
| Fallamhain | Ruler. | M | Irish |
| Fallyn | In charge. | F | Irish |
| Falon | In charge. | F | Irish |
| Faoiltiama | Wolf lady. | F | Irish |
| Farall | Variant of Farrell: Brave man. | M | Irish |
| Fardoragh | Dark-skinned man. | M | Irish |
| Farill | Variant of Farrell: Brave man. | M | Irish |
| Farry | Manly. | M | Irish |
| Farryl | Variant of Farrell: Brave man. | M | Irish |
| Feagh | Raven. | M | Irish |
| Fearadhach | Manly; masculine. | M | Irish |
| Feardorcha | Variant of Fardoragh: Dark-skinned man. | M | Irish |
| Fechin | Variant of Fehin: Little raven. | M | Irish |
| Feenat | Deer. | F | Irish |
| Fehin | Little raven. | M | Irish |
| Feich | Raven. | M | Irish |
| Feichin | Variant of Fehin: Little raven. | M | Irish |
| Feidhlim | Good forever. | M | Irish |
| Feidhlimidh | Variant of Feidhlim: Good forever. | M | Irish |
| Felan | Variant of Faolan: Small wolf. | M | Irish |
| Felim | Variant of Feidhlim: Good forever. | M | Irish |
| Ferrel | Variant of Farrell: Brave man. | M | Irish |
| Ferrell | Brave. | M | Irish |
| Ferrill | Variant of Farrell: Brave man. | M | Irish |
| Ferryl | Variant of Farrell: Brave man. | M | Irish |
| Fianait | Deer. | F | Irish |
| FIannan | Ruddy. | M | Irish |
| Fidelma | Faithful. | F | Irish |
| Findley | Variant of Finlay: Fair hero. | M | Irish |
| Fineena | Beautiful child. | F | Irish |
| Finegan | Variant of Finnegan: Fair. | M | Irish |
| Finella | White shouldered. | F | Irish |
| Finghin | Variant of Fineen: Fair birth; handsome. | M | Irish |
| Finian | light skinned; white | M | Irish |
| Finin | Variant of Fineen: Fair birth; handsome. | M | Irish |
| Finleigh | Variant of Finlay: Fair hero. | M | Irish |
| Finneen | Fair birth; handsome. Beautiful child. | M | Irish |
| Finnegan | Fair. | M | Irish |
| Finnian | Variant of Finian: Fair. | M | Irish |
| Finnin | Fair birth; handsome. Beautiful child. | M | Irish |
| Fionna | Fair. | F | Irish |
| Fionnbarr | Handsome. | M | Irish |
| Fionnbharr | Variant of Finbar: Blond-haired; handsome. | M | Irish |
| Fitzroy | son of Roy | M | Irish |
| Flaine | Variant of Flannery: Red-haired. | M | Irish |
| Flainn | Ruddy. | M | Irish |
| Flanagan | Ruddy. | M | Irish |
| Flanna | Red haired. | F | Irish |
| Flannagain | Ruddy. | M | Irish |
| Flannagan | Surname. | M | Irish |
| Flannan | Variant of Flannery: Red-haired. | M | Irish |
| Flinn | Son of a red-haired man. | M | Irish |
| Floinn | Ruddy. | M | Irish |
| Flurry | In bloom. | M | Irish |
| Flyn | Son of a red-haired man. | M | Irish |
| Fogartaigh | Exiled. | M | Irish |
| Fogarty | Exiled. | M | Irish |
| Fogerty | Exiled. | M | Irish |
| Foley | Plunders. | M | Irish |
| Forba | Owns the fields. | M | Irish |
| Forgael | Variant of Fergal: Brave. | M | Irish |
| Fynballa | Fair shoulders. | F | Irish |
| Gadhra | Mastiff. | M | Irish |
| Gaffney | Calf. | M | Irish |
| Gaile | Stranger. | M | Irish |
| Gair | small | M | Irish |
| Gairbith | Rough peace. | M | Irish |
| Galbraith | Sctosman in Ireland | M | Irish |
| Galloway | Sctosman in Ireland | M | Irish |
| Gara | Mastiff. | M | Irish |
| Garrity | Surname. | M | Irish |
| Garvan | Rough. | M | Irish |
| Garve | Rough; rugged. | M | Irish |
| Gaynor | son of the fair-skinned man | M | Irish |
| Gearoid | Spearbrave. | M | Irish |
| Geraghty | From the court. | M | Irish |
| Ghilchrist | servant of Christ | M | Irish |
| Gilroy | devoted to the king | M | Irish |
| Gilvarry | Serves Christ. | M | Irish |
| Giolla Chriost | Serves Christ. | M | Irish |
| Giollabrighde | Serves Saint Bridget. | M | Irish |
| Giollabuidhe | Blond. | M | Irish |
| Giolladhe | Golden. | M | Irish |
| Glaleanna | Dwells in the glen. | M | Irish |
| Gliona | From the Greek Cleone/ daughter of a river god. | F | Irish |
| Glynna | Of the glen. | F | Irish |
| Gofraidh | Peace from God. | M | Irish |
| Gogarty | Banished. | M | Irish |
| Golligan | Surname. | M | Irish |
| Gormain | Blue. | M | Irish |
| Gorman | small; blue eyed | M | Irish |
| Gormghlaith | Sad. | F | Irish |
| Gormley | Sad. | F | Irish |
| Gormly | Sad. | F | Irish |
| Gorrie | Peace from God. | M | Irish |
| Gorry | Peace from God. | M | Irish |
| Gothfraidh | Peaceful. | M | Irish |
| Greagoir | Watchful. | M | Irish |
| Grioghar | Watchful. | M | Irish |
| Gubnat | Irish form of Abigail: brings joy. | F | Irish |
| Hagen | Little/ young | E | Irish |
| Hanlon | Surname. | M | Irish |
| Hannraoi | Variant of Einri: Rules the home. | M | Irish |
| Hanraoi | Rules the home. | M | Irish |
| Harkin | dark red | M | Irish |
| Harrington | Surname. | M | Irish |
| Hennessy | Surname. | M | Irish |
| Higgins | Intelligent. | M | Irish |
| Hiolair | Irish form of Hilary: happy. | F | Irish |
| Hisolda | Irish form of Isolda. | F | Irish |
| Hoireabard | Soldier. | M | Irish |
| Honor | Honor. | F | Irish |
| Hoyt | mind; spirit | M | Irish |
| Hrothrehr | Famous ruler. | M | Irish |
| Hughes | Surname. | M | Irish |
| Hungas | One vigor. | M | Irish |
| Hurley | sea tide | M | Irish |
| Ibernia | From Ireland. | F | Irish |
| Ierne | From Ireland. | F | Irish |
| Ighneachan | Variant of Eigneachan: Strong man. | M | Irish |
| Ilane | Island. | F | Irish |
| Inerney | Steward of church lands. | M | Irish |
| Inis | From Ennis. | F | Irish |
| Iniss | From the river island. | M | Irish |
| Innes | From the river island. | M | Irish |
| Innis | island | M | Irish |
| Inys | From the river island. | M | Irish |
| Islene | Vision. | F | Irish |
| Izett | Irish form of Isolda. | F | Irish |
| Jarlath | Tributary lord. | M | Irish |
| Kagan | A thinker; fiery. Form of Hugh. | M | Irish |
| Kagen | A thinker; fiery. Form of Hugh. | M | Irish |
| Kaitlan | Modern phonetic form of the Irish name Caitlin from Catherine meaning pure. | F | Irish |
| Kaitleen | Modern phonetic form of the Irish name Caitlin from Catherine meaning pure. | F | Irish |
| Kaitlynn | Modern phonetic form of the Irish name Caitlin from Catherine meaning pure. | F | Irish |
| Karny | Variant of Carney: Champion; victorious. | M | Irish |
| Kasie | Alert. vigorous. Modern variant of Casey. | F | Irish |
| Kathleena | Variant of Caitlin derived from Katherine. Pure. | F | Irish |
| Kathlene | Variant of Caitlin derived from Katherine. Pure. | F | Irish |
| Kathlynn | Variant of Caitlin derived from Katherine. Pure. | F | Irish |
| Kavan | handsome | M | Irish |
| Kaven | Handsome. | M | Irish |
| Kealan | Slender. | M | Irish |
| Keallach | Variant of Ceallach: War; strife. | M | Irish |
| Kealy | Handsome. | M | Irish |
| Kean | Archaic. | M | Irish |
| Keana | Feminine of Keane meaning ancient. | F | Irish |
| Keanna | Variant of Kian. Ancient. | F | Irish |
| Keara | dark; black | F | Irish |
| Kearne | Dark. | M | Irish |
| Keavy | Graceful. | F | Irish |
| Keefe | Handsome/ beloved | M | Irish |
| Keegan | Son of Eagan/ Fiery | M | Irish |
| Keelan | Lean | E | Irish |
| Keeley | Variant of Kelly: War. Lively. Aggressive. An Irish surname and modern first name. | F | Irish |
| Keely | Beauty | F | Irish |
| Keelyn | Lively; aggressive. Variant of Kelly. | F | Irish |
| Keen | Wailing in Mourning | E | Irish |
| Keenan | Little and Ancient | M | Irish |
| Keenat | Archaic. | F | Irish |
| Keenon | Surname. | M | Irish |
| Kegan | A thinker; fiery. Form of Hugh. | M | Irish |
| Keiana | Variant of Kian. Ancient. | F | Irish |
| Kelan | Slender. | M | Irish |
| Kelcie | Brave. | F | Irish |
| Kelcy | Brave. | F | Irish |
| Kellach | Strife. | M | Irish |
| Kelleher | Loving husband. | M | Irish |
| Kellen | Powerful | E | Irish |
| Keller | little champion | M | Irish |
| Kelley | Warrior/Defender | E | Irish |
| Kellsey | Brave. | F | Irish |
| Kelly | Warrior/Defender | E | Irish |
| Kellyn | Powerful | F | Irish |
| Kelsee | Brave. | F | Irish |
| Kelsi | Brave. | F | Irish |
| Kennard | brave chieftan | M | Irish |
| Kennelly | Surname. | M | Irish |
| Keri | Variant of Kerry: Dusky. Dark. Descendents of Ciar. The name of a county of Ireland. Used for both genders. | F | Irish |
| Keriana | Dusky; dark. | F | Irish |
| Keriann | Dusky; dark. | F | Irish |
| Kerianna | Dusky; dark. | F | Irish |
| Kerianne | Dusky; dark. | F | Irish |
| Kerilyn | Dusky; dark. | F | Irish |
| Kerra | Dusky; dark. | F | Irish |
| Kerri | Dark and Mysterious | F | Irish |
| Kerrianne | Dusky; dark. | F | Irish |
| Kerrigan | Dusky; dark. A surname. | M | Irish |
| Kerry | Dark Princess | E | Irish |
| Kevay | Lovely and charming. | F | Irish |
| Keven | Handsome child. Variant of Kevin. | M | Irish |
| Keveon | Handsome child. Variant of Kevin. | M | Irish |
| Kevinn | Handsome child. Variant of Kevin. | M | Irish |
| Kevion | Handsome child. Variant of Kevin. | M | Irish |
| Kevis | Handsome child. Variant of Kevin. | M | Irish |
| Kevon | Handsome child. Variant of Kevin. | M | Irish |
| Kevron | Handsome child. Variant of Kevin. | M | Irish |
| Kiahna | Variant of Kian. Ancient. | F | Irish |
| Kiandria | Variant of Kian. Ancient. | F | Irish |
| Kiani | Variant of Kian. Ancient. | F | Irish |
| Kianna | Variant of Kian. Ancient. | F | Irish |
| Kianni | Variant of Kian. Ancient. | F | Irish |
| Kiauna | Variant of Kian. Ancient. | F | Irish |
| Kieran | Little Dark One | E | Irish |
| Kiernan | Surname. | M | Irish |
| Kildaire | From county Kildare. | M | Irish |
| Kildare | From county Kildare. | M | Irish |
| Killdaire | From county Kildare. | M | Irish |
| Kinnard | tall slope | M | Irish |
| Kinnat | Archaic. | F | Irish |
| Kinsella | Surname. | M | Irish |
| Kionah | Variant of Kian. Ancient. | F | Irish |
| Kioni | Variant of Kian. Ancient. | F | Irish |
| Kionna | Variant of Kian. Ancient. | F | Irish |
| Korey | Spear bearer. Also a variant of Corey: From the hollow. | M | Irish |
| Larkin | rough; fierce | M | Irish |
| Lawler | mutter | M | Irish |
| Lorcan | little; fierce | M | Irish |
| Lunn | warlike | M | Irish |
| Mabbina | Happiness. | F | Irish |
| Macallister | son of Alistair | M | Irish |
| Macartan | Son of Artan. | M | Irish |
| Macarthur | son of Arthur | M | Irish |
| MacAuliffe | Son of Olaf. | M | Irish |
| MacBride | Son of Bridget 'Bride'. | M | Irish |
| MacCormack | Son of Cormac. | M | Irish |
| Maccoy | son of Hugh | M | Irish |
| Maccrea | son of grace | M | Irish |
| MacElroy | Son of Elroy. | M | Irish |
| Mackenzie | Son of Kenneth | E | Irish |
| Mackinnley | son of the learned ruler | M | Irish |
| Maclean | son of Leander | M | Irish |
| Macmahon | son of Mahon | M | Irish |
| MacMaureadhaigh | Son of Murray. | M | Irish |
| MacMurra | Son of Murray. | M | Irish |
| Macmurray | son of Murray | M | Irish |
| MacQuaid | Son of Quaid. | M | Irish |
| Mad\uley | Son of Olaf. | M | Irish |
| Madailein | Irish form of Madeleine: magnificent. | F | Irish |
| Madden | Smalldog Milos. | M | Irish |
| Maeleachlainn | Servant. | M | Irish |
| Maelisa | Serves Christ. | M | Irish |
| Magee | Son of Hugh | M | Irish |
| Mago | Great. | M | Irish |
| Maguire | son of the beige one | M | Irish |
| Maher | Generous. | M | Irish |
| Mahoney | Surname. | M | Irish |
| Maible | Lovable. | F | Irish |
| Maighdlin | Irish form of Madeleine: magnificent. | F | Irish |
| Mailsi | Pearl. | F | Irish |
| Mainchin | Monk. | M | Irish |
| Mairia | Bitter. | F | Irish |
| Mairona | Bitter. | F | Irish |
| Maiti | Strong battle maiden. | F | Irish |
| Maitilda | Strong battle maiden. | F | Irish |
| Maitilde | Strong battle maiden. | F | Irish |
| Majella | Name of a saint. | F | Irish |
| Malloy | Noble chief. | M | Irish |
| Malone | Serves Saint John. Surname. | M | Irish |
| Maloney | church going | M | Irish |
| Mane | Great. | M | Irish |
| Mannix | monk | M | Irish |
| Mannuss | Great. | M | Irish |
| Maola | Handmaiden. | F | Irish |
| Maoli | Handmaiden. | F | Irish |
| Maolruadhan | Serves Saint Ruadhan. | M | Irish |
| Maonaigh | Wealthy. | M | Irish |
| Marcas | Of Mars. The Roman fertility god Mars for whom March was named. | M | Irish |
| Marmaduke | Servant of Madoc (fortunate). | M | Irish |
| Maughold | Name of a saint. | M | Irish |
| Maurya | Bitter. | F | Irish |
| Mayo | yew-tree plain | M | Irish |
| Mayra | Variant of Maire/ a Gaelic form of Mary: bitter. | F | Irish |
| Mccoy | Surname. | M | Irish |
| Meadhbh | Happiness or pearl. | F | Irish |
| Meadhra | Happy. | M | Irish |
| Meara | Filled with mirth | F | Irish |
| Mearr | Bitter. | F | Irish |
| Meave | Joy. The name of an early queen of Connaught. | F | Irish |
| Meeda | Thirsty. | F | Irish |
| Megdn | Pearl. | F | Irish |
| Melrone | Serves Saint Ruadhan. | M | Irish |
| Mogue | Name of a saint. | M | Irish |
| Molan | Servant of the storm. | M | Irish |
| Molloy | Noble chief. | M | Irish |
| Monca | Wise. | F | Irish |
| Moncha | Alone. | F | Irish |
| Monohan | Monk. | M | Irish |
| Mooney | Wealthy. | M | Irish |
| Morain | Great. | M | Irish |
| Moran | Great. | M | Irish |
| Morella | Great. | F | Irish |
| Morgayne | Medieval form of Welsh Morcan/ meaning bright sea. | F | Irish |
| Moriarty | Expert seaman. | M | Irish |
| Morrin | Long haired. | F | Irish |
| Morrissey | Choice of the sea. | M | Irish |
| Muiel | Knows the sea. | F | Irish |
| Muircheartaigh | Expert seaman. | M | Irish |
| Muire | Bitter. | F | Irish |
| Muireadhach | Lord of the sea. | M | Irish |
| Muireann | Long haired. | F | Irish |
| Muirgheal | Knows the sea. | F | Irish |
| Muirne | Beloved. | F | Irish |
| Mukonry | Hound of prosperity. | M | Irish |
| Mulcahy | Battle chief. | M | Irish |
| Mundy | From Reamon. | M | Irish |
| Murel | Knows the sea. | F | Irish |
| Murrough | Fighter of the sea. | M | Irish |
| Murtaugh | Surname. | M | Irish |
| Myma | Beloved. | F | Irish |
| Nally | Poor. | M | Irish |
| Naomhan | Holy. | M | Irish |
| Neason | Name of a saint. | M | Irish |
| Neil | Champion | M | Irish |
| Neilan | Champion Form of Neil. | M | Irish |
| Nessan | Name of a saint. | M | Irish |
| Nevan | holy | M | Irish |
| Nolan | Well Known | E | Irish |
| Noland | Well Known | E | Irish |
| Nolyn | Renowned; noble. | M | Irish |
| Noreena | Variant of Nora: light; honor. | F | Irish |
| Nulte | From Ulster. | M | Irish |
| Nulty | From Ulster. | M | Irish |
| O' | Descendent of. Irish surnames formed by prefacing O'. | M | Irish |
| Obharnait | The color of olive. | F | Irish |
| O'brian | Surname. | M | Irish |
| O'brien | Surname. | M | Irish |
| Odanodan | Of the red earth. | M | Irish |
| Odhran | Pale green. | M | Irish |
| Oengus | One vigor. | M | Irish |
| Ohnicio | Honor. | F | Irish |
| Oilbhe | Olive. | F | Irish |
| O'keefe | Surname. | M | Irish |
| Omat | The color of olive. | F | Irish |
| Oonagh | Lamb. Can also be an Irish variant of Latin 'Una': One. | F | Irish |
| Oran | Green | E | Irish |
| Orghlaith | Golden. | F | Irish |
| Orla | Golden. | F | Irish |
| Orlaith | Golden. | F | Irish |
| Orlaithe | Golden. | F | Irish |
| O'shay | Surname. | M | Irish |
| O'shea | Surname. | M | Irish |
| Ossian | Fawn. | M | Irish |
| Patterson | son of Pat | M | Irish |
| Phelan | wolf | M | Irish |
| Piran | prayer | M | Irish |
| Rian | little king | M | Irish |
| Riddock | smooth field | M | Irish |
| Roarke | famous ruler | M | Irish |
| Rogan | redheaded | M | Irish |
| Rooney | redheaded | M | Irish |
| Uaid | Irish form of Walter. | M | Irish |
| Ualtar | Strong fighter. | M | Irish |
| Uistean | Variant of Euston: Heart. | M | Irish |
| Ulicia | Feminine form of Ulik. | F | Irish |
| Ungus | One vigor. | M | Irish |
| Uny | Together. | F | Irish |
| Vevila | Harmony. | F | Irish |
| Whelan | Joyful. | M | Irish |
| Wise | Ardent or wise. | M | Irish |
| Zaira | Irish form of Sara: princess. | F | Irish |
