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Irish: shortened Anglicized form of Gaelic Ó Duinn Ó Doinn ‘descendant of Donn’ a byname meaning ‘brown-haired’ or ‘chieftain’. Compare Dunne . This name has sometimes been Anglicized as Brown . English: nickname for a dark complexioned or swarthy man from Middle English dun ‘dun dark’ (Old English dunn ‘dull brown’). Scottish: habitational name from Dun in Angus named with Gaelic dùn ‘fort’. Compare Dun . German (Dünn): nickname for a thin slender person from Middle High German dünne ‘thin small slight weak’. Chinese: variant Romanization of the surname 鄧 see Deng .
Source: Dictionary of American Family Names 2nd edition, 2022