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Last name Bortnik (Bortnik , Бортник , Бортнік ) , all around the world, is a common surname. The family name Bortnik is habitual in Belarus, where it is quite a common surname, Ukraine, and Estonia, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Eastern Europe, particularly Ukraine, Russia, and Belarus. Much less frequently, Bortnik is the forename as well as the last name.