| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Cristal | KRIS-təl | English | ||
| Cristen | KRIS-tən | English (Modern) | ||
| Crofton | KRAWF-tən | English (Rare) | ||
| Crystal | KRIS-təl | English | ||
| Cullen | KUL-ən | English | ||
| Curt | KURT | English | ||
| Curtis | KUR-tis | English | ||
| Cuthbert | KUTH-burt | English (Rare) | ||
| Cy | SIE | English | ||
| Cyan | SIE-an | English (Rare) | ||
| Cybill | SIB-əl | English (Rare) | ||
| Cydney | SID-nee | English (Modern) | ||
| Cymone | see-MON | English (Rare) | ||
| Cyndi | SIN-dee | English | ||
| Cynthia | SIN-thee-ə (English) | English, Greek Mythology (Latinized) |