Last name Гаидеи (Gaydey 
, Гаидеи , Gaidei 
) , globally, is a rare family name. The cognomen Гаидеи is characteristic of Eastern Europe, particularly Moldova, where it is quite a rare surname, Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Moldova, Russia, and the United States. Much less frequently, Гаидеи is the forename as well as the last name.