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Surname Borisz (Борис , Borisz ) , throughout the world, is a common last name. The family name Borisz is characteristic of Bulgaria, where it is a common surname, Armenia, where it is quite a common surname, and Kyrgyzstan (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Eastern Europe, particularly Bulgaria, Ukraine, and Russia. Much more frequently, Borisz is the forename as well as the last name.