Origen: Escocés. The clan from whom the McGrail family descends began among the ancient Dalriadan kingdom of the west coast of Scotland. Their name comes from the personal name Neil. The Gaelic form Mac Neill translates as son of Neil. First found in on the islands of Barra, Gigha, Colonsay, and Oronsay where they were seated from early times and their first records appeared on the census rolls taken by the ancient Kings of Britain to determine the rate of taxation of their subjects. The names McGreal and McGrail in Ireland are derived from the native Gaelic Mag Reill Sept that is akin to the Mac Neill Sept. The McGrails were a Gallowglass warrior family who established themselves in Counties Mayo and Leitrim where the majority of descendants can still today be found.

Variantes: McGrail, MacNeil, MacNeill, MacNeal, MacNeilage, MacNeale, MacNeall, MacNeille, MacNeel, MacNiel, MacGreal, Mcneil, Mcneill, McNeal, Mcneal, Mcneall y otros.