| Carlitos | | - | Spanish, Portuguese | |
| Carlos | | KAHR-los (Spanish) | Spanish, Portuguese, Catalan | |
| Carlota | | kahr-LO-tah (Spanish) | Spanish, Portuguese | |
| Carmela | | kahr-ME-lah | Italian, Spanish | |
| Carmelita | | - | Spanish | |
| Carmelo | | kahr-ME-lo | Spanish, Italian | |
| Carmen | | KAHR-men (Spanish), KAHR-mən (English) | Spanish, English, Italian, Romanian | |
| Carmina | | - | Italian, Spanish | |
| Carolina | | kah-ro-LEE-nah (Italian, Spanish), ka-roo-LEE-nə (Portuguese), ker-ə-LIEN-ə (English), kar-ə-LIEN-ə (English) | Italian, Spanish, Portuguese, English, Swedish | |
| Casimiro | | - | Spanish, Portuguese, Italian | |
| Cassandra | | kə-SAN-drə (English), kə-SAHN-drə (English), kahs-SAHN-drah (Italian) | English, Spanish, Portuguese, Italian, French, German, Greek Mythology (Latinized) | |
| Catalina | | kah-tah-LEE-nah | Spanish | |
| Cayetano | | kie-e-TAH-no | Spanish | |
| CebriÁN | | se-BRYAHN, the-BRYAHN | Spanish | |
| 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 | |