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Surname Sarasin (Sarasin , สารสิน , สาระสิน ) , in all the world, is quite a rare last name. The last name Sarasin is habitual in Monaco, where it is quite a common surname, Switzerland, where it is quite a rare surname, and Thailand, where it is a rare surname. Measured by absolute frequency, it is commonest in the United States, Thailand, and Switzerland. Much less frequently, Sarasin is the forename as well as the last name.