| Colobert | | - | Ancient Germanic | |
| Colombe | | - | French | |
| Colten | | KOL-tən | English (Modern) | |
| Colton | | KOL-tən | English (Modern) | |
| Columbine | | KAHL-əm-bien | English (Rare) | |
| Comfort | | KUM-fərt | English (Rare) | |
| Connell | | KAHN-əl | English (Rare) | |
| Conner | | KAHN-ər | English (Modern) | |
| Connie | | KAHN-ee | English | |
| 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 | |