Cognomen Qay (Гай 
, Qay 
, גאיוס 
) , around the world, is quite a rare surname. The cognomen Qay is characteristic of Ukraine, where it is quite a rare surname, Armenia, where it is a rare surname, and Russia. Not in comparison with a country's population, this name is the most popular in Ukraine, Russia, and Pakistan. Very seldom, Qay is the forename as well as the last name.