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Surname Etymology and Meaning of ROONEY

Name meanings and etymologies are often disputed. The information here is compiled from freely available sources, and no claims whatsoever are made for accuracy, either historical or etymological.

1. reduced Anglicized form of Gaelic Ó Ruanaidh ‘descendant of Ruanadh’, a byname meaning ‘champion’.
2. reduced Anglicized form of Gaelic Ó Ruadháin (see Ruane).

Source: Dictionary of American Family Names (2003)