| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Colten | KOL-tən | English (Modern) | ||
| Colton | KOL-tən | English (Modern) | ||
| Colum | - | Irish | ||
| Columban | kə-LUM-bən (English) | Irish | ||
| Columbine | KAHL-əm-bien | English (Rare) | ||
| Colwyn | - | Welsh | ||
| Comfort | KUM-fərt | English (Rare) | ||
| Comgal | - | Irish | ||
| Comgall | - | Irish | ||
| Comgan | - | Irish | ||
| ComhghÁN | - | Irish | ||
| Comhghall | - | Irish | ||
| Conall | - | Irish, Scottish, Irish Mythology | ||
| Conan | - | Irish | ||
| ConcepciÓN | kawn-thep-THYON (Spanish), kawn-sep-SYON (Latin American Spanish) | Spanish |