Surname Сергеи (Sergey 
, Sergei , Serguei 
) , all over the world, is a common last name. The surname Сергеи is characteristic of Western Asia, particularly Israel, where it is quite a common surname, Armenia, and Cyprus (explore the name in all countries). Not in comparison with a country's population, it is commonest in Israel, Armenia, and China. More prevalently, Сергеи is the forename as well as the last name.