| Claudine | Woman | French Names |
| Clef | Unisex | French Names |
| Clemance | Woman | French Names |
| Clémence | Woman | French Names |
| Clothilde | Woman | French Names |
| Clovis | Man | French Names |
| Coeur | Unisex | French Names |
| Colette | Woman | French Names |
| Coligny | Unisex | French Names |
| Coline | Woman | French Names |
| Colombe | Woman | French Names |
| Côme | Man | French Names |
| Coquette | Woman | French Names |
| Coralie | Woman | French Names |
| Corbeau | Unisex | French Names |
| Corin | Unisex | French Names |
| Corina | Woman | French Names |
| Corinne | Woman | French Names |
| Corneille | Unisex | French Names |
| Cosette | Woman | French Names |