| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Concettina | kon-chet-TEE-nah | Italian | ||
| Concetto | kon-CHET-to | Italian | ||
| Consolata | kon-so-LAH-tah | Italian | ||
| Cornelia | kawr-NE-lee-ah (German), kor-NE-lyah (Italian), kawr-NAY-lee-ah (Dutch), kər-NEE-lee-ə (English), kər-NEEL-yə (English) | German, Romanian, Italian, Dutch, English, Ancient Roman | ||
| Cornelio | kor-NE-lyo | Spanish, Italian | ||
| Corona | - | Late Roman, Italian, Spanish | ||
| Corradino | kor-rah-DEE-no | Italian | ||
| Corrado | kor-RAH-do | Italian | ||
| Cosima | - | Italian | ||
| Cosimo | KAW-zee-maw, KO-zi-mo | Italian | ||
| Cosma | - | Italian | ||
| Costantino | - | Italian | ||
| Costanzo | - | Italian | ||
| Crescenzo | - | Italian | ||
| Cristiana | kree-STYAH-nah (Italian) | Italian, Portuguese |