Cognomen Тсой (Tsoy 
, Тсой ) , around the world, is quite a common surname. The family name Тсой is characteristic of Uzbekistan, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Kazakhstan. Not in comparison with a country's population, it most frequently occurs in Uzbekistan, Kazakhstan, and Russia. Much less frequently, Тсой is the forename as well as the last name.