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Family name Litwin (Litwin , Литвин , Літвін ) , around the world, is a common cognomen. The family name Litwin is habitual in Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, and Poland. Measured by absolute frequency, the name is most common in Eastern Europe, particularly Ukraine, Russia, and Poland. Much less frequently, Litwin is the forename as well as the last name.