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Cognomen Plonka (Plonka ) , across the world, is quite a rare last name. The last name Plonka is habitual in Poland, where it is quite a rare surname, Germany, and Czechia, where it is a rare surname. Not in comparison with a country's population, it is commonest in Poland, Germany, and the United States. More frequently, Plonka is the forename as well as the last name.