Family name Souen (Souen 
, Суен 
) , across the world, is a very rare last name. The last name Souen is characteristic of Cambodia, where it is a very rare surname, Brazil, and Canada, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in Brazil, the United States, and Cambodia. Also, Souen is the forename as well as the last name.