| Colby | Unisex | English Names |
| Cole | Man | English Names |
| Coleman | Man | English Names |
| Colin | Man | English Names |
| Collier | Man | English Names |
| Collin | Man | English Names |
| Collins | Unisex | English Names |
| Colman | Man | English Names |
| Colony | Unisex | English Names |
| Colston | Man | English Names |
| Colter | Unisex | English Names |
| Colton | Man | English Names |
| Coltrane | Unisex | English Names |
| Columbine | Woman | English Names |
| Combs | Unisex | English Names |
| Comfort | Woman | English Names |
| Connie | Unisex | English Names |
| Conrad | Man | English Names |
| Conroy | Man | English Names |
| Consolation | Woman | English Names |