Irish (Munster): reduced form of McSheehy, an Anglicized
form of Gaelic Mac Síthigh ‘son of Sítheach’, a
personal name from the adjective sítheach ‘peaceful’ or
‘other worldly’. (The noun síth, from which this adjective
derives, means basically ‘settlement’, hence both ‘peace’ and ‘place
inhabited by other world beings’.) In some cases the name may be a
reduced Anglicized form of Ó Síthigh, ‘descendant of
Sítheach’, a later form of the Irish name.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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