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Cognomen Sider (Sider , Сидер , Сайдер ) , in the entire world, is quite a rare family name. The family name Sider is habitual in Bulgaria, where it is quite a rare surname, Algeria, and Israel. Measured by absolute frequency, it is the most numerous in the United States, Algeria, and Indonesia. Much less frequently, Sider is the forename as well as the last name.