| Colson | Unisex | American Names |
| Colston | Man | English Names |
| Colt | Man | American Names |
| Colter | Unisex | English Names |
| Colton | Man | English Names |
| Coltrane | Unisex | English Names |
| Colum | Man | Irish Names |
| Columbia | Woman | Latin Names |
| Columbine | Woman | English Names |
| Columbo | Man | Italian Names |
| Columbus | Man | Latin Names |
| Colwyn | Unisex | Welsh Names |
| Combs | Unisex | English Names |
| Côme | Man | French Names |
| Comfort | Woman | English Names |
| Comiskey | Unisex | Irish Names |
| Conan | Man | Irish Names |
| Conary | Unisex | Irish Names |
| Concepcion | Woman | Spanish Names |
| Concetta | Woman | Italian Names |