| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Corona | - | Late Roman, Italian, Spanish | ||
| Corradino | kor-rah-DEE-no | Italian | ||
| Corrado | kor-RAH-do | Italian | ||
| CorraidhÍN | - | Ancient Irish | ||
| Cosima | - | Italian | ||
| Cosimo | KAW-zee-maw, KO-zi-mo | Italian | ||
| Cosma | - | Italian | ||
| Cosmas | - | Ancient Greek (Latinized) | ||
| Cosmin | - | Romanian | ||
| Cosmina | - | Romanian | ||
| Costache | kos-TAH-ke | Romanian | ||
| Costantino | - | Italian | ||
| Costanzo | - | Italian | ||
| Costel | ko-STEL | Romanian | ||
| CosticĂ | kos-TEE-kə | Romanian |