| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Clarity | KLER-i-tee, KLAR-i-tee | English (Rare) | ||
| Clark | KLAHRK | English | ||
| Claud | KLAWD | English | ||
| Claude | KLOD (French), KLAWD (English) | French, English | ||
| Claudia | KLAW-dee-ə (English), KLOW-dee-ah (German, Dutch), KLOW-dyah (Italian, Spanish, Romanian) | English, German, Dutch, Italian, Spanish, Romanian, Biblical, Ancient Roman | ||
| Claudio | KLOW-dyo | Italian, Spanish | ||
| Claus | KLOWS | German, Danish | ||
| Clay | KLAY | English | ||
| Clayton | KLAY-tən | English | ||
| Cledwyn | - | Welsh | ||
| Cleena | - | Irish | ||
| Clem | KLEM | English | ||
| Clematis | klə-MAT-is | English (Rare) | ||
| Clemence | KLEM-ənts | English | ||
| Clemency | KLEM-ənt-see | English (Rare) |