Family name Zaiyun (再云 
, 在云 , Zaiyun 
) , all over the world, is a rare cognomen. The surname Zaiyun is habitual in China, where it is a very rare surname, Malaysia, and Chile, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in China, Malaysia, and Nigeria. More frequently, Zaiyun is the forename as well as the last name.