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Family name Kostal (Kostal , Košťál , Костал ) , in all the world, is quite a rare last name. The last name Kostal is habitual in Czechia, where it is quite a common surname, Slovakia, and Austria, where it is quite a rare surname. In absolute terms, it is commonest in Czechia, Slovakia, and the United States. Much less frequently, Kostal is the forename as well as the last name.