Cognomen Deydey (Deydey 
, Дейдей 
) , around the globe, is a rare family name. The cognomen Deydey is habitual in Ukraine, where it is a rare surname, Estonia, and Canada, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Ukraine, Russia, and Canada. Very seldom, Deydey is the forename as well as the last name.