| Cliffanie | Woman | American Names |
| Cloud | Unisex | American Names |
| Clovia | Woman | American Names |
| Coco | Woman | American Names |
| Cocoa | Unisex | American Names |
| Colandra | Woman | American Names |
| Coleka | Woman | American Names |
| Colissa | Woman | American Names |
| 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 |