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Cognomen Ryba (Ryba , Риба , Рыба ) , in the world, is quite a common surname. The surname Ryba is habitual in Eastern Europe, particularly Czechia, where it is quite a common surname, Poland, where it is quite a rare surname, and Slovakia. Measured by absolute frequency, it most frequently occurs in Poland, the United States, and Czechia. Likewise, Ryba is the forename as well as the last name.