| Ciaran | Man | Irish Names |
| Cicada | Woman | Greek Names |
| Cicely | Woman | English Names |
| Cicero | Man | Latin Names |
| Cicerón | Man | Spanish Names |
| Cicily | Woman | English Names |
| Cid | Man | Spanish Names |
| Ciel | Unisex | French Names |
| Cielle | Woman | American Names |
| Cielo | Woman | Spanish Names |
| Cierra | Woman | American Names |
| Cili | Woman | Hungarian Names |
| Cilicia | Woman | Latin Names |
| Cillian | Man | Irish Names |
| Cinco | Man | Spanish Names |
| Cinderella | Woman | English Names |
| Cindy | Woman | Greek Names |
| Ciniod | Man | Irish Names |
| Cinnamon | Woman | American Names |
| Cinzia | Woman | Italian Names |