Recorded in several spellings including O' Culligan, O' Quilligan, Qulligan, Culligan, McColgan, Colgan, and probably others, this is an Isrish surame. It originates from the pre 10th century Gaelic O' Cuilleagain, which means the descendant of Colgan, a name deriving from "coll", meaning a hazel tree. Quilligan, and the other variant spellings are County Clare names, as well as in the city of Limerick part of which lies on the Clare side of the Shannon. In the 19th century Culligan was much more numerous than Quilligan, but more recently they are about equal. It is thought that originally the sept was from County Offaly, migrating westwards in the 16th Century, to West Clare where they were well established by the 17th Century...
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