McLaughlin originally appeared in Gaelic as Mac Lochlainn or Ó Maoilsheachlainn. The first name is derived from a Norse personal name, while the second name originally designated a follower of St. Secundinus. Muircheartach Mac Lochlainn (died 1166), was king of Tír Eoghain, and High King of Ireland (c.1156-1166.) More @Wikipedia
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