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Family name Kaydar (Кайдар , Kaydar , קידר ) , in the world, is a rare last name. The family name Kaydar is habitual in Israel, where it is quite a rare surname, Algeria, where it is a very rare surname, and Kazakhstan. Not in comparison with a country's population, this name is the most popular in Israel, Turkey, and Algeria. More prevalently, Kaydar is the forename as well as the last name.