Surname Ergey (Ергей 
, Ergey 
, Ергеы ) , in all the world, is a rare last name. The cognomen Ergey is characteristic of Belarus, where it is a rare surname, Russia, and Kazakhstan, where it is a very rare surname. Measured by absolute frequency, the name is most common in China, Russia, and Belarus. Also, Ergey is the forename as well as the last name.