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Duncan

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MacDonough, Duncan, Mac Donnchadha, Ó Duinnchinn

 

The surname Duncan is an Anglicized form of the Irish Gaelic name "MacDonough" or "Mac Donnchadha" and "Ó Duinnchinn", meaning "descendant of Donncheann". The Gaelic Donncheann is a byname composed of the elements "Donn", meaning "brown-haired man" or "chieftain", and "ceann", meaning "head".