| Constans | | - | Late Roman | |
| Constantia | | - | Late Roman | |
| Constantin | | kon-stahn-TEEN (Romanian), kawn-stawn-TEN (French) | Romanian, French | |
| Constantina | | - | Late Roman | |
| Constantinus | | - | Late Roman | |
| Constantius | | - | Late Roman | |
| Consus | | - | Roman Mythology | |
| Corbinianus | | - | Late Roman | |
| Corina | | - | English, German, Romanian | |
| Cornel | | - | Romanian | |
| 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 | |
| Corneliu | | - | Romanian | |
| Cornelius | | kər-NEE-lee-əs (English), kawr-NAY-lee-us (Dutch), kawr-NE-lee-uws (German) | Ancient Roman, English, Dutch, German, Biblical | |
| Corona | | - | Late Roman, Italian, Spanish | |
| Cosmin | | - | Romanian | |