Scottish and northern English: patronymic from a pet form of
Pate, a short form of Patrick.
Irish: in Ulster of
English or Scottish origin; in County Galway, a surname taken by
bearers of Gaelic Ó Caisín ‘descendant of the little
curly-headed one’ (from Gaelic casán), which is usually
Anglicized as Cussane.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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