| Clementine | - | Latin Name | Clementius | - | Dutch Name |
| Clennan | - | Scottish Name | Cleo | - | American Name |
| Cleopatra | - | African Name | Cleophas | - | Biblical Name |
| Cleveland | - | English Name | Cliff | - | English Name |
| Clint | - | English Name | Clinton | - | English Name |
| Clio | - | Australian Name | Clive | - | English Name |
| Cloe | - | American Name | Cloee | - | American Name |
| Cloey | - | Greek Name | Cloie | - | Greek Name |
| Cloud | - | American Name | Clover | - | Anglo Name |
| Cluny | - | Gaelic Name | Clyde | - | Scottish Name |
| Cnidus | - | Biblical Name | Cnut | - | Anglo Name |
| Coal | - | Gaelic Name | Coatl | - | Nahuatl Name |
| Coaxoch | - | Nahuatl Name | Cobar | - | Australian Name |
| Coburn | - | Scottish Name | Coby | - | Scottish Name |
| Cocheta | - | American Name | Cochise | - | American Name |
| Coco | - | French Name | Coda | - | Italian Name |
| Codee | - | Irish Name | Codey | - | Irish Name |
| Codi | - | Irish Name | Codi | - | American Name |
| Codie | - | Australian Name | Cody | - | English Name |
| Coen | - | Dutch Name | Cohen | - | Hebrew Name |
| Cohen | - | Australian Name | Coigleach | - | Gaelic Name |
| Coilin | - | Scottish Name | Coilleach | - | Gaelic Name |
| Coinleain | - | Gaelic Name | Coinneach | - | Gaelic Name |
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