| Connie | Unisex | English Names |
| Conrad | Man | English Names |
| Conroy | Man | English Names |
| Consolation | Woman | English Names |
| Constance | Woman | English Names |
| Cook | Unisex | English Names |
| Cookie | Unisex | English Names |
| Cooper | Unisex | English Names |
| Cope | Unisex | English Names |
| Copeland | Unisex | English Names |
| Coral | Woman | English Names |
| Corbett | Man | English Names |
| Corbin | Unisex | English Names |
| Corby | Unisex | English Names |
| Corbyn | Man | English Names |
| Cordelia | Woman | English Names |
| Cordell | Man | English Names |
| Corduroy | Unisex | English Names |
| Cork | Unisex | English Names |
| Corliss | Unisex | English Names |