Cognomen Zaday (Zaday 
, Задай 
) , around the world, is a very rare last name. The surname Zaday is habitual in Venezuela, where it is a very rare surname, Russia, where it is an extremely rare surname, and Mexico. Not in comparison with a country's population, it is the most numerous in Russia, Pakistan, and Mexico. Also, Zaday is the forename as well as the last name.