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Ó Tighearnaigh, Tierney


Tierney is an Irish surname derived from the Gaelic O'Tighearnaigh. The name comes from 'tighearna' meaning 'lord' or 'master, consequently O'Tighearnaigh means the son or male descendant of Tighearnach. The earliest records of the surname were found in County Limerick in the early 18th century.