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In the entire world, Sider (Sider , Сидер , Сайдер ) is quite a rare predominantly masculine, but very infrequently feminine given name. The forename Sider is characteristic of Bulgaria, where it is quite a rare boy's name, Israel, where it is a rare primarily girly, but scarcely boy's name, and Costa Rica, where it is a rare masculine name. Measured by absolute frequency, the name is most common in Bulgaria, the Democratic Republic of the Congo, and Indonesia. More prevalently, Sider is the last name as well as the forename.