Last name origin & meaning: Northern Irish: Anglicized form of Gaelic Mac Dhonnchaidh
‘son of Donnchadh’, a widely used personal name meaning ‘brown
one or chief of battle’, from donn ‘brown-haired’ or ‘chief’ +
cath ‘battle’, which is Anglicized as Donagh or
Duncan. Derivatives in which the personal name is unlenited
include Donahue and McDonough; these derive from the
early genitive form, Donnchadha. Forms ending in -y
derive from the later genitive, Donnchaidh.
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