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Last name Mackay (Mackay , 麦凯 , Маккей ) , in all the world, is a common surname. The last name Mackay is characteristic of Marshall Islands, where it is a common surname, New Zealand, where it is quite a common surname, and Aruba (explore the name in all countries). In absolute terms, this name is the most popular in the United Kingdom, the United States, and Canada. Much less frequently, Mackay is the forename as well as the last name.