| Calisto | | kah-LEE-sto (Spanish) | Portuguese, Spanish | |
| Calixta | | - | Spanish, Portuguese | |
| Calixto | | - | Spanish, Portuguese | |
| Cam (1) | | - | Vietnamese | |
| Camila | | kah-MEE-lah (Spanish) | Spanish, Portuguese | |
| Camilo | | kah-MEE-lo (Spanish) | Spanish, Portuguese | |
| Carina (1) | | kə-REEN-ə (English), kah-REE-nah (German) | English, Portuguese, Spanish, German, Late Roman | |
| Carla | | KAHR-lah (Spanish, German, Dutch), KAHR-lə (English) | Italian, Portuguese, Spanish, Catalan, English, German, Dutch | |
| Carlinhos | | - | Portuguese | |
| Carlito | | kahr-LEE-to (Spanish) | Spanish, Portuguese | |
| Carlitos | | - | Spanish, Portuguese | |
| Carlos | | KAHR-los (Spanish) | Spanish, Portuguese, Catalan | |
| Carlota | | kahr-LO-tah (Spanish) | Spanish, Portuguese | |
| Carmo | | - | Portuguese | |
| 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 | |