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Last name Sidis (Sidis , Сідіс , سيديس) , across the world, is a rare cognomen. The last name Sidis is characteristic of Israel, where it is quite a rare surname, Belgium, where it is a rare surname, and Australia. Not in comparison with a country's population, it most frequently occurs in Israel, Belgium, and Indonesia. Likewise, Sidis is the forename as well as the last name.