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| Name | Meaning | Gender | Origin |
| Clemance | Merciful | F | French |
| Clemens | From the name CLEMENT | M | English |
| Clement | Gentle/ Merciful | M | English |
| Clementine | Merciful | F | English |
| Cleo | To Praise/ Acclaim | F | Greek |
| Cleon | famous | M | Greek |
| Cleopatra | Glory of the Father | F | Greek |
| Cleta | Dim. of CLEOPATRA | F | Greek |
| Cleveland | Land of High Cliffs | M | English |
| Cliff | From the name CLIFFORD | M | English |
| Clifford | From a Steep Cliff | M | English |
| Clifton | From a Town near a Cliff | M | English |
| Clint | From the name CLINTON | M | English |
| Clinton | Town on a Hill | M | English |
| Clio | From the name CLEO | F | Greek |
| Clive | Cliff Dweller | M | English |
| Clodagh | From the name of an Irish river/ Clodagh is used occasionally as a first name in Ireland. | F | Irish |
| Clodia | Form of CLAUDIA | F | French |
| Clodius | Lame. | M | Latin |
| Clodovea | Feminine form of Clodoveo: famous warrior. | F | Spanish |
| Clodoveo | Famous warrior. | M | Spanish |
| Cloris | Flower Goddess | F | Greek |
| Clotild | Renowned for war. | F | Teutonic |
| Clotilda | Heroine. Famous battle. Derived from the Old German 'hloda' meaning loud or famous/ and 'hildi' meaning battle. Famous bearer: 6th century saint Clotilda was married to King Clovis/ and played a major role in his conversion to Christianity. | F | German |
| Clotilde | Renowned for war. | F | Teutonic |
| Clove | A Nail/ Spice | E | German |
| Clover | Meadow Flower | F | English |
| Clovis | Famous soldier (fm. Louis) | M | German |
| Cluny | meadow | M | Irish |
| Clustfeinad | Mythical father of Clust. | M | Celtic |
| Clyde | warm | M | Celtic/Gaelic |
| Clyff | Diminutive of Clifford: River ford near a cliff. | M | English |
| Cobhan | Dwells by the hillside hollow. | M | Gaelic |
| Coburn | Surname and place name. | M | English |
| Cobweb | A Midsummer Night's Dream' A fairy. | M | Shakespearean |
| Coby | Supplanter | E | Hebrew |
| Coch | Legendary son of Caw. | M | Welsh |
| Cochava | Star. | F | Hebrew |
| Cocheta | That You Cannot Imagine | F | Native American |
| Cochise | Wood. Renowned warrior chief of the Chiricahua Apache. | M | Native American |
| Cochlain | Hooded. | M | Irish |
| Cocidius | Mythical hunter god. | M | Celtic |
| Cocles | A hero who saved Rome. | M | Latin |
| Coco | cocunut | F | Spanish |
| Cody | A Cushion | M | English |
| Coen | Brave/ alt. sp. Koen | M | German |
| Coillcumhann | From the narrow forest. | M | Irish |
| Coilleach | Guards the forest. | M | Gaelic |
| Coinleain | Shaped as a well. | M | Gaelic |
| Coinneach | Handsome. | M | Celtic |