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Reilly Surname Origin

(Origin Irish) shortened form of O’Reilly, an Anglicized form of Gaelic Ó Raghailligh ‘descendant of Raghailleach’

Source: An Etymological Dictionary of Family and Christian Names With an Essay on their Derivation and Import; Arthur, William, M.A.; New York, NY: Sheldon, Blake, Bleeker & CO., 1857.

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You will get the best search results if you double-check your spelling. Be sure to search for Reilly ancestor not ansestor or ancester; ancestry, not ancestory or ancestery. Surname is the preferred spelling, but sometimes you may see alternate spellings sirname and sirename.