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Welsh (especially Glamorgan): from the medieval Welsh personal name Morgan Morgant (Old Welsh Morcant of uncertain etymology). Irish: importation of the Welsh surname (see 1 above) to which has been assimilated more than one Gaelic surname notably Ó Muireagáin (see Merrigan ). Scottish: probably from a Gaelic personal name cognate with Welsh Morcant. Altered form of Maugans a surname of German origin.
Source: Dictionary of American Family Names 2nd edition, 2022