Mulhern is an Irish (midland and Ulster) family name. It is anglicized form of Gaelic Ó Maoilchiaráin, ‘descendant of Maoilchiaráin’ , a personal name meaning ‘devotee of (Saint) Ciarán’ (a personal name from a diminutive of ciar ‘black’).
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Mulhern Wikipedia(Text) CC BY-SA