Cognomen Gaydo (Gaydo 
, Гайдо 
) , throughout the world, is a rare last name. The last name Gaydo is habitual in Eastern Europe, particularly Belarus, where it is a rare surname, Russia, where it is a very rare surname, and Ukraine. Not in comparison with a country's population, it is the most numerous in Russia, the United States, and Belarus. Very seldom, Gaydo is the forename as well as the last name.