Scully, ó Scolaidhe, ó Scolaighe A Gaelic sept who were originally chiefs of West Devlin in Westmeatrh until dispersed early in the twelfth century. The surname is derived from scolaige meaning ‘scholar, schoolman’. Subsequently they became erenaghs of the church of St. Ruan, at Lorrha in north Tipperary. There is a townland called Ballyscully in the Parish of Duniry, Barony of Leitrin, in Galway. In 1890 Scully was principally found in Cork, Dublin, Carlow and Ofally, and the estimated number of bearers was 2,910. In the United States Scully is the 4,238th most numerous surname with an estimated 8,250 bearers.