| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Clarisa | klah-REE-sah | Spanish | ||
| Clarissa | klə-RIS-ə (English) | English, Italian, Portuguese, Spanish | ||
| Claritia | - | Late Roman | ||
| Clarity | KLER-i-tee, KLAR-i-tee | English (Rare) | ||
| Clarus | - | Late Roman | ||
| 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 | ||
| Claudiu | - | Romanian | ||
| Claudius | KLAW-dee-əs (English) | Ancient Roman | ||
| Claus | KLOWS | German, Danish | ||
| Cleisthenes | KLIES-thə-neez (English) | Ancient Greek (Latinized) | ||
| Cleitus | - | Ancient Greek (Latinized) | ||
| Clelia | - | Italian | ||
| Clematis | klə-MAT-is | English (Rare) | ||
| Clemency | KLEM-ənt-see | English (Rare) |