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MCNAIR Family HistoryThis interesting name, with spellings MacNair, MacNayer, Macneir, Macnuir and MacNuyer, and the short spellings commencing Mc, is Scottish and sometimes Irish. It is considered to have four origins. Firstly, it may be derived from the pre 10th century Gaelic Mac Iain Uidhir, translating as " The son of sallow John", through the form Mac-an-uidir, and later condensed into M' In-nir; hence, Macnair. The Macnairs of Rossshire derive their name from this source. The Perthshire nameholders are a branch of the MacNabs, and explain their name as "son of the heir", from "Mac an Oighre". Perthshire documents record the surname as MacNayre in 1370...
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