| Cathrine | | - | Swedish, Norwegian, Danish | |
| Catina | | - | Romanian | |
| Cato (1) | | - | Ancient Roman | |
| Catrin | | KAT-rin (Welsh), KAHT-reen (German) | Welsh, German | |
| Cayetano | | kie-e-TAH-no | Spanish | |
| Ceadda | | - | Anglo-Saxon | |
| CebriÁN | | se-BRYAHN, the-BRYAHN | Spanish | |
| CecÍLia | | - | Portuguese, Slovak, Hungarian | |
| Cecilia | | sə-SEE-lee-ə (English), sə-SEEL-yə (English), che-CHEE-lyah (Italian), the-THEE-lyah (Spanish), se-SEE-lyah (Latin American Spanish), se-SEEL-yah (Danish, Norwegian), SE-see-lee-ah (Finnish) | English, Italian, Spanish, Swedish, Danish, Norwegian, Finnish, Dutch, German | |
| Cecilie | | se-SEEL-ye (Norwegian, Danish) | Norwegian, Danish, Czech | |
| Cecilija | | - | Slovene, Croatian | |
| Cecilio | | the-THEE-lyo (Spanish), se-SEE-lyo (Latin American Spanish), che-CHEE-lyo (Italian) | Spanish, Portuguese, Italian | |
| Ceferino | | the-fe-REE-no (Spanish), se-fe-REE-no (Latin American Spanish) | Spanish | |
| Celeste | | che-LE-ste (Italian), sə-LEST (English) | Italian, English | |
| Celestina | | the-le-STEE-nah (Spanish), se-le-STEE-nah (Latin American Spanish), che-le-STEE-nah (Italian) | Spanish, Italian | |