Last name origin & meaning:
Irish: Anglicized form of Gaelic Mac Maghnuis, patronymic
from a Gaelic form of the Scandinavian personal name Magnus. As
an Irish name this is found chiefly in Roscommon and Fermanagh and is
connected with the O’Connors or the Maguires; in Scotland it is
connected with the Colquhouns.
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