Irish: reduced form of O’Sheehan, an Anglicized form of
Gaelic Ó Síodhacháin ‘descendant of
Síodhachán’, a personal name representing a diminutive of
síodhach ‘peaceful’, the same word as
sítheach. Compare Sheehy.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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