Ó Gallchobhair is the original Irish Gaelic form of the surname Gallagher, deeply rooted in the history of County Donegal, Ireland. Derived from the given name Gallchobhar (from Old Irish gall 'stranger' and cobar 'desiring'), the surname signifies 'descendant of Gallchobhar'. Historical Significance The Ó Gallchobhair family was one of the leading clans of Cenél Conaill, the tribal grouping descended from Conall Gulban, son of High King Niall of the Nine Hostages. Originating in the 10th century with Gallchobhar mac Rorcain, the O'Gallaghers held the High Kingship of Ireland during the early medieval period and later served as hereditary Marshals of the Kingdom of Tyrconnell, ruled by their kinsmen the O'Donnells, from the 14th to the early 17th century. Naming and Anglicization As with many Irish surnames, the Gaelic prefix Ó indicates 'grandson' or 'descendant', and the root derives from a personal name. The Anglicized form 'Gallagher' became widespread after the decline of Gaelic culture in Ireland, particularly in County Donegal under the control of the O'Donnells. Notable Surname Bearers While historically tied to the O'Gallagher clan chieftains, the modern surname is borne by many prominent figures across various fields. These include U.S. Representative Cary Gallagher, writer/actor Edwina Gallagher, and boxing trainer Barney Gallagher. For a liturgical perspective, notable Franciscan and Jesuit training organizations in County Donegal also sustained the cultural heritage associated with the name. Meaning: 'stranger-desiring' (descendant of Gallchobhar) Origin: Irish Gaelic Type: Clan surname (Ó Gallchobhair) Usage Regions: Ireland (chiefly County Donegal), worldwide diaspora