"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." ~ Wikipedia. The motto is - By Serving I Govern. On top of the family crest is an oak tree. The shield has a red … Continue reading Surname Saturday – Tierney Family of Northern Ireland