| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Conley | - | Irish | ||
| Conn | - | Irish | ||
| Connla | - | Irish Mythology | ||
| Connor | KAHN-ər (English) | Irish, English (Modern) | ||
| Conor | KAHN-ər (English) | Irish, English, Irish Mythology | ||
| ConrÍ | - | Irish | ||
| Cormac | - | Irish | ||
| CorraidhÍN | - | Ancient Irish | ||
| Cowal | - | Irish | ||
| CrÍOstÓIr | - | Irish | ||
| CuÁN | - | Irish | ||
| Cuidightheach | - | Ancient Irish | ||
| CuimÍN | - | Irish | ||
| DÁIbhÍ | - | Irish | ||
| DÁIrÍNe | - | Irish |