Family name Gritsayuk (Gritsayuk , Грицаюк ) , in the world, is a rare cognomen. The surname Gritsayuk is characteristic of Eastern Europe, particularly Ukraine, where it is quite a rare surname, Russia, where it is a rare surname, and Belarus, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Ukraine, Russia, and the United States.