Recorded as O'Tiernan, MacTiernan, McTiernan, and Tiernan, this notable surname is Irish. It derives from the Old Gaelic name MacTighearnain, meaning the son of Tierna, a name meaning lord or master. Traditionally, Irish family names are taken from the heads of tribes, revered elders, or some illustrious warrior, and are usually prefixed by "Mac", denoting "son of", or "O", grandson, male descendant of. Two separate septs of MacTiernan arose independently in Ireland, the first belonged to the Ulster county of Cavan, and were a branch of the great O'Rourkes, styled Lords of Breffny, whose chieftains ruled territory in Counties Cavan and Leitrim...
Join the conversation with the TIERNAN tribe
Find your TIERNAN ancestor
Tell us about your TIERNAN Family
Tell us about your TIERNAN ancestors
Ask a question about the TIERNAN history
Leave a message for TIERNAN family members
Areas of Origin for TIERNAN
Invite more TIERNAN family members!
Write an email address and click 'Invite' to share this page with more members of the TIERNAN tribe.