The moynihan Surname
moynihan Name Meaning and History
Irish: Anglicized form of Gaelic Ó Muimhneacháin
‘descendant of Muimhneachán’, a diminutive of the byname
Muimhneach ‘Munsterman’, i.e. someone belonging to the province
of Munster. (In County Mayo this surname has sometimes been changed to
Munster.)
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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