McQuillan, Mac Uidhilín A surname of Cambro-Norman origin, meaning son of Hugelin. The de Mandeville’s became Lords of the Route in Antrim and had their chief residence at Dunluce Castle. They also established themseles at Dufferin in Down. Mac Coilín of Tirconnell, may also have been so anglicised. Also see McWilliams. In 1890 it was principally found in Antrim and Monaghan. The estimated number of bearers was 1,480.
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