English: variant of Deary, or alternatively a nickname
for a merchant or tradesman, from Anglo-French darree
‘pennyworth’, from Old French denree.
Irish:
Anglicized form of Gaelic Ó Doiridh, the name of an
eccesiastical family from Donegal, meaning ‘descendant of
Doireadh’. Derry is often confused with Deery.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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