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Family name Kubas (Kubas , Кубас , Кубась ) , across the world, is quite a rare surname. The last name Kubas is habitual in Namibia, where it is quite a common surname, Poland, where it is quite a rare surname, and Slovakia. Not in comparison with a country's population, it is the most numerous in Poland, the United States, and Namibia. Likewise, Kubas is the forename as well as the last name.