| Clemens | | KLE-mens (German) | German, Dutch, Swedish, Norwegian, Danish, Late Roman | |
| Clemente | | kle-MEN-te (Italian, Spanish) | Italian, Spanish, Portuguese | |
| Clementia | | - | Late Roman | |
| Clementina | | kle-men-TEE-nah (Italian, Spanish), klə-mən-TEE-nə (Portuguese) | Italian, Spanish, Portuguese | |
| Clementius | | - | Late Roman | |
| Cleon | | - | Ancient Greek (Latinized) | |
| Cleopas | | KLEE-ə-pəs (English) | Biblical, Biblical Latin | |
| Cleopatra | | klee-ə-PAT-rə (English) | Ancient Greek (Latinized) | |
| Cleophas | | KLEE-ə-fəs (English) | Biblical | |
| Cletis | | KLEE-tis | English (Rare) | |
| Cleto | | KLE-to (Italian, Spanish) | Italian, Spanish, Portuguese | |
| Climacus | | - | Late Roman | |
| Climent | | klee-MENT | Catalan | |
| Clio | | KLEE-o (Italian) | Greek Mythology (Latinized), Italian | |
| Clitus | | - | Ancient Greek (Latinized) | |