Gormley (modern Irish: Ó Garmaile)[1] is an Irish surname. It is derived from the Gaelic Ó Goirmleadhaigh meaning 'descendant of Gormghal'. The main sept of the clan originated in Tyrconnell (present day County Donegal) and then spread into Tyrone. The Ulster branch of the clan were chiefs of the Cenél Moain and originated in what is now the barony of Raphoe in East Donegal, an area known in Gaelic times as Tír Moain. The common ancestor and progenitor of these Gormleys was Moain son of Muireadach, son of Eoghan, son of Niall of the Nine Hostages.