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MCMASTER Family History

This interesting surname is of Gaelic origin, found in Ireland and Scotland, and is the Anglicized form of the Gaelic name "MacMaighstir", composed of the Gaelic prefix "Mac", son of, and "maighstir", master, a cleric, from the Latin "magister". In Scotland the surname is now found mainly in the shires of Dumfries and Wigtown, but was also the name of a sept in Ardgour which traditionally are said to have been dispossessed by the Macleans in the 15th Century. In Ireland, the MacMasters are a Breffny sept (Cavan and West Leitrim) and early Anglicized forms of the name recorded in the "Fiants" (circa early 1600's) include: MacAmaster, MacYmaster and MacMester, and were found in all stations of life, mostly in Cavan and Longford .
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    Ralph E Bedwell

    I'm interested in anything I can find out about my McMaster roots. My great-great-grandfather was John McMaster, born in 1830 in County Tyrone. He came to the U.S. in 1849 and lived the rest of his life in Dixon, Illinois. Family legend has it that his father, who did not emigrate, was a lay Catholic preacher, but I don't know his name. 
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    John McMaster 23/2/55
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    The surname was originally Mac a mhaighstir
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