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I don't think you'll find it. I don't know of any lines of descent to the present from any of the Ó Riagáin septs (I reckon that there were four). I know Ronald R. claimed descent from the Dalcassian O'Regans akin to Brian Boru but without proof.
Some record searcher claimed to have found Reagan's great grandparents' marriage recorded in the parish register of Ballyporeen, Co. Tipperary, but later scrutineers have alleged that the P.R. entry was doctored.