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Surname Sandin (Sandin , 沙丁 , 桑丁 ) , around the world, is quite a common family name. The cognomen Sandin is habitual in Sweden, where it is quite a common surname, Uruguay, where it is quite a rare surname, and Finland. Not in comparison with a country's population, it is the most numerous in Sweden, the United States, and Mexico. Very seldom, Sandin is the forename as well as the last name.