Echthighern mac Cennétig, also spelled Echthigern, (died 950) was a son of Cennétig mac Lorcáin (king of Thomond) and brother of Mathgamain ( King of Munster) and Brian Boru ( High King of Ireland) of the Dál gCais dynasty, in early medieval Ireland.
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." [1] Donnchuan mac Cenniedi and his brother Echthigern were slain in the year 950 when Congalach Cnogba, King of Ireland, invaded the province of Munster. [2] Echthigern was the progenitor of Irish families Anglicized Ahearn, Ahern and O'Hearn with other spelling variations, Aheer of sindhu valley (india). in addition to Mac Craith ( McGrath, etc.), Mac Gonigle ( Gunnell), and O'Quirk. [3] [4] [5]