Donnelly (surname)
It is derived from the Gaelic Ó Donnghaile meaning 'descendant of Donnghal',[1] a given name composed of the elements donn ('dark, brown') and gal ('valour').[2] O'Donnelly was historically of the Northern Uí Néill's Cenél nEoghain, descended from Donnghal,[3] the great-grandson of Domhnall, King of Ailech.According to Gaelic Irish tradition, the Donnellys were part of the Cenél nEoghain making them kin of the O'Neills.He demolished the castle; and he made a prisoner of the son of O'Neill, who was foster-son of Donnelly, and carried him off, together with the horses and the other spoils of the town.At the start of the Plantation of Ulster, Ballydonnelly was allocated as a 'Servitor' portion and as such was granted to Sir Toby Caulfeild who had served in the Crown forces during the Nine Years' War.