Scottish and Irish (of Scottish origin): from the Gaelic
personal name Donnchadh, composed of the elements donn
‘brown-haired man’ or ‘chieftain’ + a derivative of cath
‘battle’, Anglicized in Ireland as Donagh or
Donaghue. Compare Donahue.
Irish (Sligo):
used as an Anglicized equivalent of Gaelic Ó Duinnchinn
‘descendant of Donncheann’, a byname composed of the elements
donn ‘brown-haired man’ or ‘chieftain’ + ceann ‘head’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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