| Clothildis | | - | Ancient Germanic (Latinized) | |
| Clovis | | KLO-vis (English), klo-VEES (French) | Ancient Germanic (Latinized), French | |
| Colobert | | - | Ancient Germanic | |
| Conrad | | KAHN-rad (English), KAWN-raht (German) | English, German, Ancient Germanic | |
| Constanze | | - | German | |
| Cora | | KAWR-ə (English) | English, German, Greek Mythology (Latinized) | |
| Corbinian | | kawr-BEE-nee-ahn | German | |
| Cord | | KAWRT | German | |
| Cordula | | - | German | |
| Corina | | - | English, German, Romanian | |
| Corinna | | kə-REEN-ə (English), kə-RIN-ə (English), ko-RI-nah (German) | English, German, Ancient Greek (Latinized) | |
| Cornelia | | kawr-NE-lee-ah (German), kor-NE-lyah (Italian), kawr-NAY-lee-ah (Dutch), kər-NEE-lee-ə (English), kər-NEEL-yə (English) | German, Romanian, Italian, Dutch, English, Ancient Roman | |
| Cornelius | | kər-NEE-lee-əs (English), kawr-NAY-lee-us (Dutch), kawr-NE-lee-uws (German) | Ancient Roman, English, Dutch, German, Biblical | |
| Crescentia | | - | German, Late Roman | |
| Cunigund | | - | Ancient Germanic | |