| Consolation | Woman | English Names |
| Constance | Woman | English Names |
| Constantijn | Man | Dutch Names |
| Constantine | Man | Latin Names |
| Constantino | Man | Italian Names |
| Consuelo | Woman | Spanish Names |
| Consus | Man | Latin Names |
| Content | Woman | American Names |
| Contessa | Woman | Italian Names |
| Contreras | Unisex | Spanish Names |
| Conwal | Man | French - Old Breton Names |
| Conway | Man | Irish Names |
| Conyers | Man | American Names |
| Cook | Unisex | English Names |
| Cookie | Unisex | English Names |
| Cooper | Unisex | English Names |
| Copacati | Woman | Incan Names |
| Cope | Unisex | English Names |
| Copeland | Unisex | English Names |
| Coquette | Woman | French Names |