McKay, MacAoidh A Scottish surname derived from the Gaelic meaning son of Aodh (Hugh). There appears to be two families of the name from : Moray in the north, and from Invernessshire (Mac Ai). Also see: McCoy, McHugh, and Keys. In 1890 the surname was principally found in Antrim, and the estimated number of bearers was 2,870. In the United States it is the 849th most numerous surname with an estimated 38,500 bearers. In Scotland in 1995 Mackay was the 42nd most numerous surname, and McKay was the 83rd most numerous surname.
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