Surname Хаиюн (Haijun 
, Хаиюн 
, Khaiyun 
) , worldwide, is a rare cognomen. The family name Хаиюн is characteristic of Singapore, where it is a rare surname, Switzerland, and Malaysia, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in China, Indonesia, and Spain. Much more frequently, Хаиюн is the forename as well as the last name.