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The origin and meaning of the name 'Rielly' are primarily associated with Irish heritage. It is a variant spelling of 'Reilly,' which itself is derived from the Gaelic surname Ó Raghallaigh, signifying 'descendant of Raghallach.' Raghallach is interpreted as 'strong warrior' or 'powerful ruler.' Therefore, 'Rielly' carries connotations of strength, leadership, and noble ancestry within Irish culture.