Overview
Tierney is an Anglicized form of Irish Ó Tiarnaigh (male), Ní Thiarnaigh (female), also spelled Ó Tighearnaigh/Ní Thighearnaigh. It is derived from tiarna, the Irish word for lord or master.
Four unrelated families of the name arose in Gaelic Ireland, in what is now County Mayo, County Monaghan, County Meath, and County Tipperary.
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