| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Costanzo | - | Italian | ||
| Costel | ko-STEL | Romanian | ||
| CosticĂ | kos-TEE-kə | Romanian | ||
| Costin | - | Romanian | ||
| Cowessess | - | Native American, Ojibwe | ||
| Cree | KREE | English (Rare) | ||
| Creighton | KRAY-tən | English (Rare) | ||
| Crescencia | - | Spanish | ||
| Crescens | - | Late Roman, Biblical Latin | ||
| Crescentia | - | German, Late Roman | ||
| Crescentius | - | Late Roman | ||
| Crescenzo | - | Italian | ||
| Cressida | KRES-ə-də (English) | Literature | ||
| Crina | KREE-nah | Romanian | ||
| Crispian | - | English (Archaic) |