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Cognomen Sems (サム , แซม , Sems ) , in the entire world, is a rare last name. The cognomen Sems is habitual in Japan, where it is a rare surname, Egypt, where it is a very rare surname, and Thailand. Measured by absolute frequency, it is commonest in Japan, the United States, and Egypt. Also, Sems is the forename as well as the last name.