Family name Saisei (Saisei 
, Муро 
) , globally, is a very rare last name. The surname Saisei is habitual in Japan, where it is a very rare surname, Russia, and Ukraine, where it is an extremely rare surname. In absolute terms, it most frequently occurs in Japan, Russia, and the United States. More frequently, Saisei is the forename as well as the last name.