This is an Irish surname of great antiquity and also great confusion. Recorded in a number of spellings including MacMenamin, McMenamin, MacManamon, McManamon, McMennuam, McMennum, and cross integrated with such English and Scottish surnames such as Merriman, Marmion and even the Irish O'Merry, much remains to be dscovered as to its true origins, even its translation being uncertain. There is a claim that it derives from the Gaelic "Mag giolla Mheidre", meaning "the son of the merryman", but this is disputed as being a translation of the English surname Merryman, also widely recorded and overlapping in Ireland, and therefore not a logical explanation...
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