Irish: shortened Anglicized form of Gaelic Ó
hAiseadha ‘descendant of Aisidh’, a personal name meaning
‘discord’, ‘strife’.
English and Irish: shortened form of the
habitational name Blennerhasset, from a place in Cumbria, so
named from Celtic blain ‘summit’ + an unexplained second
element + Old Scandinavian hey ‘hay’ + s?tr
‘shieling’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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