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Surname Clam (Clam , หอยมุข , แย้มกล่ำ) , around the globe, is quite a rare last name. The cognomen Clam is characteristic of Mauritius, where it is quite a rare surname, Philippines, where it is a rare surname, and France. Measured by absolute frequency, it most frequently occurs in Philippines, France, and Indonesia. Much less frequently, Clam is the forename as well as the last name.