Echthighern mac Cennétig
The historian Geoffrey Keating states that during the twelve-year period that Mathgamain held the sovereignty of Munster, "Echthighearn, son of Cinneide, was chief of Thomond." Donnchuan mac Cenniedi and his brother Echthigern were slain in the year 950 when Conghalach, King of Ireland, invaded the province of Munster. Echthigern was the progenitor of Irish families Anglicized Ahearn, Ahern and O'Hearn with other spelling variations, in addition to Mac Craith (McGrath, etc.), Mac Gonigle (Gunnell), and O'Quirk.
- Geoffrey Keating The History of Ireland Vol I, page 235. Celt Corpus Electronic Texts
- page 242 ibid.
- Tadhg Ó Donnchadha (ed.), "An Leabhar Muimhneach" (Dublin 1940)
- Psalter of Cashel
- Edward MacLysaght, "The Surnames of Ireland", Dublin (1991 edition)