| Connor | | KAHN-ər (English) | Irish, English (Modern) | |
| Conor | | KAHN-ər (English) | Irish, English, Irish Mythology | |
| Conrad | | KAHN-rad (English), KAWN-raht (German) | English, German, Ancient Germanic | |
| Constance | | KAHN-stənts (English), kawn-STAWNS (French) | English, French | |
| Constant | | kawn-STAWN (French), KAHN-stənt (English) | French, English (Rare) | |
| Constantin | | kon-stahn-TEEN (Romanian), kawn-stawn-TEN (French) | Romanian, French | |
| Conway | | KAHN-way | English | |
| Cooper | | KOOP-ər, KUWP-ər | English | |
| Cora | | KAWR-ə (English) | English, German, Greek Mythology (Latinized) | |
| Coral | | KAWR-əl (English) | English, Spanish | |
| Coralie | | - | French | |
| Corbin | | KAWR-bin | English | |
| Cordelia | | kawr-DEL-ee-ə, kawr-DEL-yə | English | |
| Cordell | | kawr-DEL | English | |
| Coreen | | kə-REEN | English (Rare) | |