O'Callaghan
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O'Callaghan (/əˈkæləhən, oʊ-, -hæn, -ɡən, -ɡæn/[1][2]) or simply Callaghan without the prefix (anglicized from two separate surnames and clans, Ó Ceallacháin, Munster Clan. Ó Ceileacháin, Oriel Clan) is an Irish surname.