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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Reilly Last Name Meaning
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Reilly family history than the origin of your surname:
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A Reilly Family History Thought:
A family tree can wither if nobody tends its roots .
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