Ó Rabhartaigh is the Irish Gaelic form of the surname Rafferty. It is derived from the Irish word rabharta, meaning "flood tide" or "stormy sea," and originally belonged to a medieval Irish clan. The name is traditionally associated with Tír Eoghain (modern-day Tyrone, Northern Ireland), where the Gallóglaigh (mercenary warriors) who bore this name were noted for their fierce reputation. Historical Context The Ó Rabhartaigh sept was part of the Cenél Fearadáigh tribal grouping, with historical records placing them in the barony of Strabane. Like many Irish surnames, Ó Rabhartaigh was anglicised to Rafferty during the 19th century, though the original form persists in some genealogical records. Notable Bearers Notable individuals bearing the surname include Paddy "Ó Rabhartaigh", a Donegal musician known for preserving traditional Irish tunes, and Diarmuid Ó Rabhartaigh, a 20th-century Irish author who documented Ulster folklore. The variant spelling "Ó Rabhartaigh" primarily appears in birth, marriage, and death records from pre-Famine Ireland. Related Names Related surnames include Rafraída, another Gaelic variant, and the English surname Rafferty, which became common in Australia and the United States through Irish diaspora. Meaning: "flood tide" or "righteous prosperity" Origin: Irish Gaelic Type: Surname (patronymic) Usage Regions: Ireland (particularly Tyrone and Ulster)