English and Irish: from the Middle English personal name
Sinod, Old English Sigenoð, composed of the
elements sige ‘victory’ + noð ‘brave’ Although of
English origin, the surname is now far more common in Ireland than in
England; it has been prominent in Wexford since the 13th century.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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