| Colleen | Woman | American Names |
| Colletta | Woman | American Names |
| Collice | Woman | American Names |
| Colson | Unisex | American Names |
| Colt | Man | American Names |
| Condoleeza | Woman | American Names |
| Content | Woman | American Names |
| Conyers | Man | American Names |
| Coraline | Woman | American Names |
| Coretta | Woman | American Names |
| Corine | Woman | American Names |
| Corom | Man | American Names |
| Corvina | Woman | American Names |
| Coryn | Unisex | American Names |
| Covid | Woman | American Names |
| Crayton | Man | American Names |
| Creed | Man | American Names |
| Creola | Unisex | American Names |
| Cricket | Unisex | American Names |
| Cyan | Unisex | American Names |