| Clee | Unisex | English Names |
| Clegg | Unisex | English Names |
| Clem | Man | English Names |
| Clematis | Woman | English Names |
| Clemency | Unisex | English Names |
| Clement | Man | English Names |
| Clementina | Woman | English Names |
| Clementine | Woman | English Names |
| Cleveland | Man | English Names |
| Cliff | Man | English Names |
| Clifford | Man | English Names |
| Clifton | Man | English Names |
| Clint | Man | English Names |
| Clinton | Man | English Names |
| Clive | Man | English Names |
| Clorinda | Woman | English Names |
| Clover | Woman | English Names |
| Cobb | Man | English Names |
| Cody | Man | English Names |
| Coe | Unisex | English Names |