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Scope == The surname Meehan is from the Irish Gaelic name Uí Miadhachain (oh mee-ach-awn) that derives from Miadhach , which means "honourable".There seem to be three major branches:* Uí Miadhachain - the original Meehan family that is said to be a branch of the McCarthys from Munster that settled in Country Leitrim, at Ballymeehan (then Ballaghameighan/Ballagh Meighan) and spread to the surrou...