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Surname Borsuk (Borsuk , Bursuc , Борсук ) , worldwide, is a common cognomen. The last name Borsuk is characteristic of Eastern Europe, particularly Moldova, where it is quite a common surname, Romania, and Ukraine, where it is quite a rare surname. In absolute terms, it most frequently occurs in Eastern Europe, particularly Ukraine, Romania, and Russia. Much less frequently, Borsuk is the forename as well as the last name.