| Cleisthenes | | KLIES-thə-neez (English) | Ancient Greek (Latinized) | |
| Cleitus | | - | Ancient Greek (Latinized) | |
| Clemens | | KLE-mens (German) | German, Dutch, Swedish, Norwegian, Danish, Late Roman | |
| Clementine | | klə-mawn-TEEN | French | |
| 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 | |
| Climent | | klee-MENT | Catalan | |
| Clitus | | - | Ancient Greek (Latinized) | |
| CloÉ | | klo-E (French) | Portuguese, French | |
| Clodovicus | | - | Ancient Germanic (Latinized) | |
| Cloelia | | - | Ancient Roman | |
| Cloelius | | - | Ancient Roman | |
| Clopas | | KLO-pəs (English) | Biblical | |