Family name Sioun (Sion 
, Сюн 
, Sioun 
) , in the entire world, is a common last name. The family name Sioun is characteristic of Suriname, where it is quite a common surname, Brunei, where it is quite a rare surname, and France. Not in comparison with a country's population, it most frequently occurs in Philippines, France, and Indonesia. Likewise, Sioun is the forename as well as the last name.