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Donlon Family HistoryThis interesting and unusual surname is of Old Gaelic origin, and is a variant of "O'Donnellan", itself the Anglicized form of the Gaelic "O'Domhnallain", which is composed of the Gaelic prefix "O", meaning "male descendant of", and the personal name "Domhnall", Donnell, who was the lord of Clan Breasail, from whom bearers of the name claim descent. The O'Donnellans were a sept of the Ui Maine who were settled in the south-eastern part of County Galway, where the placename Ballydonnellan erpetuates their connection with the district between Ballinasloe and Loughrea. The original castle of Ballydonnellan is reputed to have been built by them in 936 A...
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