Throughout the world, Ergei (Ергей 
, Ergei 
) is a rare masculine forename. The forename Ergei is characteristic of Belarus, where it is quite a rare boy's name, Russia, where it is a rare male name, and Kazakhstan, where it is a very rare male name. Not in comparison with a country's population, it most frequently occurs in Russia, Belarus, and China. Likewise, Ergei is the last name as well as the forename.