| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 321 | Connlyn | Irish | Variant of Conlan: Hero. | M | |
| 322 | Connolly | Irish | Brave or wise. | M | |
| 323 | Connor | Irish | Strong willed or wise 'Hound-lover.' Also from the Irish 'Coachuhhar', meaning high desire. Famous bearers: In Irish mythology Connor was an early king of Ulster.; 20th century Irish diplomat Conor Cruise O'Brien. | M | |
| 324 | Conny | Irish | Strong willed or wise. Also a diminutive of Conlan: Hero. | M | |
| 325 | Conor | Irish | Strong willed or wise 'Hound-lover.' Also from the Irish 'Coachuhhar', meaning high desire. | M | |
| 326 | Conquhare | Irish | Variant of Conchobhar: Strong dog; strong willed or wise. | M | |
| 327 | Conroy | Irish | Wise or red. | M | |
| 328 | Conway | Irish | Hound of the plain. | M | |
| 329 | Cony | Irish | Variant of Corey 'Hill hollow.'. | M | |
| 330 | Cooey | Irish | Hound of the plains. | M | |
| 331 | Cooley | Irish | Hound of Ulster. | M | |
| 332 | Coolie | Irish | Hound of Ulster. | M | |
| 333 | Cooney | Irish | Handsome. | M | |
| 334 | Corbmac | Irish | Charioteer. | M | |
| 335 | Corcoran | Irish | Cork; reddish skin. Surname. | M | |
| 336 | Corey | Irish | From the round hill or hollow.'. | M | |
| 337 | Cori | Irish | From the round hill. | M | |
| 338 | Corin | Irish | Spear bearer. Also a variant of Corey: From the hollow. | M | |
| 339 | Corky | Irish | Variant of Corey 'Hill hollow.'. | M | |
| 340 | Corlan | Irish | Spear-bearer. | M | |