| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Clodagh | - | Irish | ||
| Cloe | - | Spanish, Italian | ||
| Clotilda | klə-TIL-də | English | ||
| Clotilde | klo-TEELD (French) | French, Italian, Portuguese, Spanish | ||
| Clover | KLO-vər | English (Rare) | ||
| Clyde | KLIED | English | ||
| Cnut | KNOOT (English), KNYOOT (English) | History | ||
| CoŞKun | - | Turkish | ||
| Coby | KO-bee | English | ||
| Coco | KO-ko | Various | ||
| Codie | KO-dee | English (Modern) | ||
| Cody | KO-dee | English, Irish | ||
| Cohen | KO-ən | English | ||
| Coilean | - | Irish | ||
| Coinneach | - | Scottish |