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Dunleavy Family HistoryRecorded in the myriad and contrasting spellings of Aleavy, Aleevy, Dunleavy, Dunsleve, and the patronymics MacDunlevy, McDunlevy, MacDunleavy, McDunleavy, with MacGlew, McGlew and McGlue, this is a surname of two claimed nationalities, but a single Gaelic origin. Whether Irish or Scottish, it is a much corrupted dialectal derivative of the ancient Mac Duinnshleibhe, meaning 'the son of Don of the mountain' or similar, from 'sliabh', a mountain. Most surnames of West Scotland are to be found in (mainly) Northern Ireland and vice versa, although sometimes, as with this surname, the spellings have strayed to a point where the relationship is not easy to understand.
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