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Allen is a Celtic surname, originating in Scotland, and common in Ireland and Wales. It is a variation of the surname MacAllen and may be derived from two separate sources: "Ailin", in Scottish and Irish Gaelic, means both "little rock" and "harmony", or it may also be derived from the Celtic "Aluinn", which means "handsome". Variant spellings include Alan, Allan, McAllen etc. The noble family of this surname, from which a branch went to Portugal, is descended of one Alanus de Buckenhall.

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