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Tierney is an irish surname. Anglicized form of Gaelic Ó Tiarnaigh (Male), Ní Tiarnaigh(Female), also Tighearnaigh/Tighearnach. Pronounced "teer + nee". Originated in Co. Mayo and also has roots in Counties Donegal and Westmeath and now widely scattered. It is derived from tiarna , the Irish word for lord or master.

A sixth-century saint, Tierney of Clones had the privilege of being baptized by St. Conleth of Kildare with St. Brigid as his godmother. As a young man he was captured by pirates and taken to the British king who placed him in the monastery of Rosnat in England. He later returned to Ireland and became Bishop of Clogher in County Down.