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Last name Clayton (Clayton , Клейтон , קלייטון ) , throughout the world, is a common cognomen. The last name Clayton is habitual in Guernsey, where it is quite a common surname, Jamaica, and Aland Islands (explore the name in all countries). Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Australia. Also, Clayton is the forename as well as the last name.