O’Shea, ó Séaghdha, ó Se A Gaelic surname meaning descendant of Seaghdha, which personal name was a rare early Irish name meaning ‘fine, stately’. A sept of the Corcu Dhuibhne in west Kerry, who were Lords of Uíbh Ráthach, now the barony of Iveragh, prior to the Cambro-Norman Invasion. A branch of this sept migrated to Kilkenny and Tipperary in the thirteenth century. A sept of the Uí Fiachrach, in the barony of Tirawley, Mayo. In 1890 O’Shea was the forty-ninth most numerous surname and the estimated number of bearers was 13,000, and the surname was principally to be found in Kerry (146 births), Cork, Kilkenny, Tipperary and Waterford. In the United States Shea is the 1,001st most numerous surname with an estimated 33,000 bearers, and O’Shea is the 4,326th most numerous surname with an estimated 8,250 bearers. It is numerous in the states of Connecticut, and Massachusetts.
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