Fergus mac Róich
In its original form Ciarraighe ("Ciarraí"), it denoted "the kingdom of Ciar" ("ciar raighe"), Ciar being the son of Fergus mac Róich, who gave his name to County Kerry. Ciarraighe was thus the name of the pre-Gaelic tribe who lived in the area of what is now County Kerry. However, branches of the Ciarraighe were all over Ireland: