| Celestino | | the-le-STEE-no (Spanish), se-le-STEE-no (Latin American Spanish), che-le-STEE-no (Italian) | Spanish, Italian, Portuguese | |
| Celia | | SEEL-yə (English), SEE-lee-ə (English), THE-lyah (Spanish), SE-lyah (Latin American Spanish), CHE-lyah (Italian) | English, Spanish, Italian | |
| Celino | | che-LEE-no (Italian), the-LEE-no (Spanish), se-LEE-no (Latin American Spanish) | Italian (Rare), Spanish (Rare) | |
| Celio | | CHE-lyo (Italian), THE-lyo (Spanish), SE-lyo (Latin American Spanish), SE-lyoo (Portuguese) | Italian, Spanish, Portuguese | |
| Celso | | CHEL-so (Italian), THEL-so (Spanish), SEL-so (Latin American Spanish) | Italian, Spanish, Portuguese | |
| Celsus | | - | Ancient Roman | |
| Cenhelm | | - | Anglo-Saxon | |
| Cenric | | - | Anglo-Saxon | |
| Ceolmund | | - | Anglo-Saxon | |
| Cerdic | | - | Anglo-Saxon | |
| Ceres | | - | Roman Mythology | |
| Cesare | | CHE-zah-re | Italian | |
| Cesarina | | che-sah-REE-nah | Italian | |
| Cesarino | | che-sah-REE-no | Italian | |
| Cesc | | SESK | Catalan | |