| Name | Meaning | Gender | Origin |
|---|
| Ailill | Mythical King Of Connaught | Male | Celtic |
| Annwfn | Mythical Name Of The Otherworld | Female | Celtic |
| Annwn | Mythical Name Of The Otherworld | Female | Celtic |
| Celyddon | Mythical Father Of Culhwch | Male | Celtic |
| Clust | Mythical Son Of Clustfeinad | Male | Celtic |
| Clustfeinad | Mythical Father Of Clust | Male | Celtic |
| Cocidius | Mythical Hunter God | Male | Celtic |
| Conall Cernach | Mythical Ulster Chieftain | Male | Celtic |
| Cradawg | Mythical Son Of Bran | Male | Celtic |
| Culain | Mythical Smith | Male | Celtic |