The Irish surname Cahill is an anglicized form of the Gaelic surname Ó Cathail meaning “descendant of Cathal.” The personal name Cathal means “powerful in battle.” The principal sept of the O'Cahills belonged to Co. Galway but by the early 13th century their place had been taken by the O' Shaughnessys. Today the name is chiefly found in the Munster counties of Clare, Tipperary, Cork and Kerry. Three townlands called Ballycahill exist in Co. Tipperary. The first recorded spelling of the family name is shown to be that of Flan O' Cahill, martyred. which was dated 938 Ancient Irish Records. during the reign of Siol Chuinn, descendants of Conn of the Hundred Battles. Today there are more than 21,000 bearers of the last name Cahill living in The United States.
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