All over the world, Сайдер (Sider 
, Saider 
, Sayder 
) is a rare primarily boy's, but very seldom feminine first name. The given name Сайдер is characteristic of Bulgaria, where it is a rare boy's name, Israel, where it is a rare primarily female, but scarcely boy's name, and Costa Rica, where it is a rare masculine name. In absolute terms, it is the most numerous in the Democratic Republic of the Congo, India, and Indonesia. More prevalently, Сайдер is the last name as well as the forename.