| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 281 | Cleo | Greek | Illustrious. | M | |
| 282 | Cleobis | Greek | Son of a priestess. | M | |
| 283 | Cleon | Greek | Famed; famous; illustrious. | M | |
| 284 | Cletus | Greek | Variant of Anakletos: Calling forth; summoned. | M | |
| 285 | Cleytus | Greek | Illustrious. | M | |
| 286 | Cocytus | Greek | River of lamenting. | M | |
| 287 | Coeus | Greek | Father of Leto. | M | |
| 288 | Coireall | Greek | Lordly. | M | |
| 289 | Cole | Greek | People's victory. | M | |
| 290 | Colin | Greek | Variant of Nicholas: People's victory. | M | |
| 291 | Colum | Greek | People's victory. | M | |
| 292 | Coridan | Greek | Ready to fight. | M | |
| 293 | Corybantes | Greek | Priest of Rhea. | M | |
| 294 | Corydon | Greek | Ready to fight. | M | |
| 295 | Cos | Greek | Order. | M | |
| 296 | Cosima | Greek | Order. | M | |
| 297 | Cosimo | Greek | Variant of Cosmo: From 'kosmos' meaning order. | M | |
| 298 | Cosmas | Greek | Order. | M | |
| 299 | Cosme | Greek | Variant of Cosmo: From 'kosmos' meaning order. | M | |
| 300 | Cosmo | Greek | From 'kosmos' meaning order. St Cosmas, patron saint of physicians, and his twin brother St Damian were martyred in the early 4th century. | M | |