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Cognomen Coates (Coates , كوتس, Коутс ) , all around the world, is a common last name. The last name Coates is characteristic of Guernsey, where it is quite a common surname, Antigua and Barbuda, and Isle of Man (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.