| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| 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) | ||
| Cyril | SIR-əl (English), SEER-əl (English), TSI-ril (Czech) | English, French, Czech, Slovak | ||
| Cyrilla | - | English (Rare) | ||
| Cyrus | SIE-rəs (English) | English, Biblical, Biblical Latin, Ancient Greek (Latinized) | ||
| Dacre | - | English (Rare) | ||
| Daffodil | DAF-ə-dil | English (Rare) |