The tiernan Surname
tiernan Name Meaning and History
Irish (Westmeath and Mayo): reduced Anglicized form of Gaelic
Ó Tíghearnáin ‘descendant of Tíghearnán’,
a diminutive of Tighearna, a byname meaning ‘lord’, ‘master’.
Compare Tierney, McKiernan. Woulfe believes Ó
Tíghearnáin to be a variant of Ó Tíghearnaigh
(see Tierney) in both counties.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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