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Surname Milligan (Milligan , מיליגן , Миллиган ) , throughout the world, is a common cognomen. The cognomen Milligan is characteristic of Northern Europe, particularly Isle of Man, where it is quite a common surname, Guernsey, and the United Kingdom, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Canada.