| Cliff | - | English Name | Clifford | - | United States Name |
| Clifton | - | Teutonic Name | Clint | - | United States Name |
| Clinton | - | Teutonic Name | Clinton | - | English Name |
| Clinton | - | Maori Name | Clio | - | Australian Name |
| Clitomachus | - | Phoenician Name | Clive | - | English Name |
| Clive | - | Teutonic Name | Cloe | - | American Name |
| Cloee | - | American Name | Cloey | - | Greek Name |
| Cloie | - | Greek Name | Cloud | - | American Name |
| Clover | - | Anglo Name | Clovis | - | Swiss Name |
| Cluny | - | Gaelic Name | Clyde | - | Scottish Name |
| Cnidus | - | Biblical Name | Cnut | - | Anglo Name |
| Co?ar | - | Turkish Name | Co?kun | - | Turkish Name |
| Coal | - | Gaelic Name | Coatl | - | Nahuatl Name |
| Coaxoch | - | Nahuatl Name | Cobar | - | Aborigin Name |
| Coburn | - | Scottish Name | Coby | - | Teutonic Name |
| Cocheta | - | American Name | Cochise | - | American Name |
| Coco | - | French Name | Coda | - | Italian Name |
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