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Dunn : 1: 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.2: English: nickname for a dark complexioned or swarthy man from Middle English dun ‘dun dark’ (Old English dunn ‘dull brown’).3: Scottish: habitational name from Dun in Angus named with Gaelic dùn ‘fort’. Compare Dun.4: German (Dünn): nickname for a thin slender person from Middle High German dünne ‘thin small slight weak’.5: Chinese: variant Romanization of the surname 鄧 see Deng.
Source : DAFN2 : Dictionary of American Family Names 2nd edition, ©2022 by Patrick Hanks and Oxford University Press
FANBI : The Oxford Dictionary if Family Names in Britain and Ireland, ©2016, University of the West of England
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