| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Clancy | KLANT-see | Irish, English (Rare) | ||
| Clarette | - | English (Rare) | ||
| Clarity | KLER-i-tee, KLAR-i-tee | English (Rare) | ||
| Clematis | klə-MAT-is | English (Rare) | ||
| Clemency | KLEM-ənt-see | English (Rare) | ||
| Cletis | KLEE-tis | English (Rare) | ||
| Clover | KLO-vər | English (Rare) | ||
| Colene | kah-LEEN | English (Rare) | ||
| Collyn | kah-LEEN | English (Rare) | ||
| Columbine | KAHL-əm-bien | English (Rare) | ||
| Comfort | KUM-fərt | English (Rare) | ||
| Connell | KAHN-əl | English (Rare) | ||
| Constant | kawn-STAWN (French), KAHN-stənt (English) | French, English (Rare) | ||
| Coreen | kə-REEN | English (Rare) | ||
| Coriander | KAWR-ee-an-dər | English (Rare) |