| Cletus | - | Teutonic Name | Cleve | - | Teutonic Name |
| Cleveland | - | English Name | Cliff | - | United States Name |
| Clifford | - | United States Name | Clifton | - | West Indies Name |
| Clint | - | English Name | Clinton | - | English Name |
| Clinton | - | West Indies Name | Clitomachus | - | Phoenician Name |
| Clive | - | English Name | Clive | - | West Indies Name |
| Cloud | - | American Name | Clovis | - | Swiss Name |
| Cluny | - | Gaelic Name | Clyde | - | Scottish Name |
| Cnut | - | Anglo Name | Co?ar | - | Turkish Name |
| Co?kun | - | Turkish Name | Coal | - | Gaelic Name |
| Coatl | - | Nahuatl Name | Cobar | - | Aborigin Name |
| Coburn | - | Scottish Name | Coby | - | Scottish Name |
| Cochise | - | American Name | Coda | - | Italian Name |
| Codey | - | Irish Name | Codey | - | Teutonic Name |
| Cody | - | English Name |
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