| 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 |
| Coyne | Man | French Names |
| Cress | Unisex | French Names |
| Crue | Man | French Names |
| Currier | Unisex | French Names |
| Cybille | Woman | French Names |