Comments (Meaning / History Only)
Per the "O'Reilly" Wikipedia page: "The original form of the name, Ó Raghallaigh, denotes 'from/of Raghallach', the name Raghallach thought to be derived from the compounds ragh (meaning 'race') and ceallach (meaning 'sociable')."
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Riley is a translated version of the name Raghallaigh. Once the man with the name died, he made his name to a surname and gave it to his son; Ó Raghallaigh (Of Raghallaigh). The name remained a surname for many years until the Irish immigrated to America and started translating Ó Raghallaigh to O'Reilly. Even O'Reilly started being translated to Riley. Eventually, it became a first name once again. It currently hits #133 for boys in the United States. The meaning is "Valiant" in Irish Gaelic.
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Irish meaning small stream.
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Riley is an Irish name.
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Riley/Reilly I have seen is also Irish meaning "courageous or valiant" and I have also seen the Irish meaning to be "small stream".
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