| Cortney | - | American Name | Corwin | - | Gaelic Name |
| Cory | - | American Name | Corynn | - | Greek Name |
| Cosam | - | Biblical Name | Cosette | - | French Name |
| Cosima | - | Australian Name | Cosmo | - | Greek Name |
| Cosmo | - | Italian Name | Costin | - | Romanian Name |
| Coszcatl | - | Nahuatl Name | Cotovatre | - | Arthurian Name |
| Coty | - | English Name | Courtland | - | Anglo Name |
| Courtlyn | - | American Name | Courtnay | - | Anglo Name |
| Courtney | - | Anglo Name | Cove | - | English Name |
| Coven | - | Irish Name | Coventina | - | Anglo Name |
| Cowan | - | Gaelic Name | Cowin | - | Latin Name |
| Coy | - | English Name | Coyle | - | Gaelic Name |
| Coyotl | - | Nahuatl Name | Coz | - | Biblical Name |
| Cozamalotl | - | Nahuatl Name | Cozbi | - | Biblical Name |
| Cozette | - | French Name | Crag | - | English Name |
| Cragen | - | Welsh Name | Craig | - | Scottish Name |
| Crannog | - | Scottish Name | Craolyn Draw | - | English Name |
| Crayton | - | Scottish Name | Creiddyladl | - | Arthurian Name |
| Creighton | - | Scottish Name | Creola | - | American Name |
| Crescens | - | Biblical Name | Cressida | - | Muslim Name |
| Crete | - | Biblical Name | Crew | - | English Name |
| Crewe | - | English Name |
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