Surname Seiun (Seiun 
, 星雲 
) , globally, is a rare last name. The cognomen Seiun is habitual in Japan, where it is a rare surname, Georgia, where it is a very rare surname, and Nigeria, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Japan, China, and Nigeria. More prevalently, Seiun is the forename as well as the last name.