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McElroy Family HistoryRecorded in many spelling forms including MacIlroy, MacElroy, McIlroy, McElroy, McGilroy, McAlroy and others, this is both a Scottish and Irish surname. It is an anglicized spelling form of the Gaelic "Mac Giolla Ruaidh", composed of the elements "Mac", meaning son of, "giolla", the youth, and "ruaidh", red haired; hence, "The son of the red haired youth". The sept originated in County Fermanagh, Ireland, where the placename Ballymackilroy is found: Their territory was on the east side of Lough Erne.
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