| Costel | Man | Romanian Names |
| Cotton | Man | English Names |
| Coty | Unisex | English Names |
| Courtland | Man | English Names |
| Courtney | Unisex | English Names |
| Cove | Unisex | English Names |
| Coven | Unisex | English Names |
| Coventina | Woman | Irish Names |
| Covid | Woman | American Names |
| Coy | Unisex | English Names |
| Coye | Unisex | English Names |
| Coyne | Man | French Names |
| Coyote | Unisex | Aztec Names |
| Coyotl | Man | Aztec Names |
| Cozcatl | Man | Aztec Names |
| Craig | Man | Scottish Names |
| Crane | Unisex | English Names |
| Crawford | Man | English Names |
| Crayton | Man | American Names |
| Creda | Woman | English Names |