| 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 |
| Cornell | Man | English Names |
| Cort | Man | English Names |
| Cosmo | Man | English Names |
| Cotton | Man | English Names |