The Clan/Sept History

Mac Cionnaith means son of Cionnaith, a personal name. The clan originated in Co. Meath in the east of the country, and subsequently moved northward to Truagh, an area on the border of the modern counties of Tyrone and Monaghan. There, they became lords and ruled until the 17th century. Today, the surname is one of the 100 most numerous surnames in Ireland, and remains popular in its original homeland of counties Monaghan and Tyrone.