| Name | Meaning | Gender | Origin |
| Odra | From Odra. | F | Indian |
| Odran | Pale. | M | Gaelic |
| Odwolf | Wealthy wolf. | M | English |
| Odwolfe | Wealthy wolf. | M | English |
| Odwulf | Wealthy wolf. | M | English |
| Ody | Wealthy defender. | M | Anglo-Saxon |
| Odysseia | Wrathful. | F | Greek |
| Odysseus | Full of Wrath | M | Greek |
| Oedipus | Swollen foot. | M | Greek |
| Oegelsby | Fearsome. | M | English |
| Oeneus | King of Calydon. | M | Greek |
| Oengus | One vigor. | M | Irish |
| Oenomaus | Son of Ares. | M | Greek |
| Oenone | Lover of Paris. | F | Greek |
| Oetavian | Born eighth. | M | Latin |
| Ofer | young deer | M | Hebrew |
| Offa | Name of a king. | M | Anglo-Saxon |
| Ofira | Gold | F | Hebrew |
| Ofra | Fawn. | F | Hebrew |
| Ofydd | Welsh form of Ovid 'a Roman poet'. | M | Welsh |
| Og | A cake/ bread baked in ashes. | M | Biblical |
| Ogaleesha | Wears a red shirt (Sioux). | M | Native American |
| Ogden | From the Valley of Oaks | M | English |
| Ogdon | From the oak tree valley. | M | English |
| Ogelsby | Fearsome. | M | English |
| Ogelsvie | Fearsome. | M | English |
| Ogelsvy | Fearsome. | M | English |
| Ogilhinn | From the high peak. | M | Scottish |
| Ogilvie | From the high peak. | M | Scottish |
| Ogin | Wild rose. | F | Native American |
| Ohad | Praising/ confessing. | M | Biblical |
| Ohanko | Reckless. | M | Native American |
| Ohanzee | Shadow | M | Native American |
| Ohcumgache | Little wolf (Cheyenne). | M | Native American |
| Ohel | Tent/ tabernacle/ brightness. | M | Biblical |
| Ohio | Large River | E | Native American |
| Ohitekah | Brave (Sioux). | M | Native American |
| Ohnicio | Honor. | F | Irish |
| Oidhche | Night. | M | Scottish |
| OIethe | Honest. | F | Latin |
| Oifa | Mythical sister of Ove. | F | Celtic |
| Oighrig | Well spoken. | F | Greek |
| Oihane | From the Forest | F | Spanish |
| Oilbhe | Olive. | F | Irish |
| Oilell | A mythical queen. | F | Celtic |
| Oilibhear | Relic. | M | Norse |
| Oistin | Venerable | E | Latin |
| OIwyna | White foot print. | F | Welsh |
| Ojal | Vision | F | Hindi |
| Ojo | difficult delivery | M | Yoruba |