| 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 | |
| Celestina | | the-le-STEE-nah (Spanish), se-le-STEE-nah (Latin American Spanish), che-le-STEE-nah (Italian) | Spanish, Italian | |
| 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 | |
| Charo | | CHAH-ro | Spanish | |
| Che | | CHE | Spanish | |
| Chelo | | CHE-lo | Spanish | |
| Chimo | | CHEE-mo (Spanish) | Catalan, Spanish | |
| Chita | | CHEE-tah | Spanish | |
| Chucho | | CHOO-cho | Spanish | |
| Chus | | CHOOS | Spanish | |