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Surname Kubiak (Kubiak , Кубяк , Куб'Як ) , in the world, is a common last name. The family name Kubiak is habitual in Poland, where it is quite a common surname, Germany, where it is quite a rare surname, and Luxembourg. Not in comparison with a country's population, this name is the most popular in Poland, the United States, and Germany. Likewise, Kubiak is the forename as well as the last name.