Surname Donoy (Donoy 
, Доной 
) , in the world, is a very rare family name. The surname Donoy is habitual in Kazakhstan, where it is a very rare surname, Russia, and Ukraine, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Russia, Kazakhstan, and the United States. Much less frequently, Donoy is the forename as well as the last name.