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Family name Rybak (Rybak , Рыбак , Рибак , and others...) , throughout the world, is a common last name. The surname Rybak is characteristic of Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, and Poland. Measured by absolute frequency, this name is the most popular in Eastern Europe, particularly Ukraine, Poland, and Russia. Likewise, Rybak is the forename as well as the last name.