| Cleo | Woman | Greek Names |
| Cleodora | Woman | Greek Names |
| Cleon | Man | Greek Names |
| Cleopatra | Woman | Greek Names |
| Cliantha | Woman | Greek Names |
| Clio | Woman | Greek Names |
| Cloris | Woman | Greek Names |
| Colista | Woman | Greek Names |
| Cora | Woman | Greek Names |
| Coralia | Woman | Greek Names |
| Coriander | Unisex | Greek Names |
| Corinna | Woman | Greek Names |
| Corinthia | Woman | Greek Names |
| Corissa | Woman | Greek Names |
| Corydon | Man | Greek Names |
| Cosmas | Man | Greek Names |
| Creusa | Woman | Greek Names |
| Cy | Man | Greek Names |
| Cybil | Woman | Greek Names |
| Cyd | Unisex | Greek Names |