| Clemens | | KLE-mens (German) | German, Dutch, Swedish, Norwegian, Danish, Late Roman | |
| Clement | | KLE-mənt | English | |
| Clemente | | kle-MEN-te (Italian, Spanish) | Italian, Spanish, Portuguese | |
| Clementina | | kle-men-TEE-nah (Italian, Spanish), klə-mən-TEE-nə (Portuguese) | Italian, Spanish, Portuguese | |
| Cleo | | KLEE-o | English | |
| Cletis | | KLEE-tis | English (Rare) | |
| Cleto | | KLE-to (Italian, Spanish) | Italian, Spanish, Portuguese | |
| Cletus | | KLEE-təs | English | |
| Cleve | | KLEEV | English | |
| Cleveland | | KLEEV-lənd | English | |
| Cliff | | KLIF | English | |
| Clifford | | KLIF-ərd | English | |
| Clifton | | KLIF-tən | English | |
| Clint | | KLINT | English | |
| Clinton | | KLIN-tən | English | |