| Clancy | | KLANT-see | Irish, English (Rare) | |
| Clara | | KLAH-rah (Italian, German, Spanish), KLER-ə (English), KLAR-ə (English) | Italian, German, Spanish, Portuguese, Catalan, Romanian, English, Swedish, Danish, Late Roman | |
| Clare | | KLER, KLAR | English | |
| Clarence | | KLER-ənts, KLAR-ənts | English | |
| Clarette | | - | English (Rare) | |
| Claribel | | KLER-ə-bel, KLAR-ə-bel | English | |
| Clarice | | klə-REES | English | |
| Clarinda | | klə-RIN-də | English | |
| Clarissa | | klə-RIS-ə (English) | English, Italian, Portuguese, Spanish | |
| 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 | |
| Clay | | KLAY | English | |