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Family name Borislaw (Борислав , Borislaw ) , all around the world, is a rare surname. The surname Borislaw is habitual in Bulgaria, where it is quite a rare surname, Belarus, where it is a very rare surname, and Spain. Not in comparison with a country's population, the name is most common in Eastern Europe, particularly Bulgaria, Russia, and Belarus. Much more frequently, Borislaw is the forename as well as the last name.