Globally, Rousen (Русен 
, Rousen 
, Reuser 
) is a rare predominantly boy's, but scarcely girly first name. The given name Rousen is characteristic of Bulgaria, where it is quite a rare masculine name, China, where it is an extremely rare male name, and India, where it is an extremely rare epicene name. More prevalently, Rousen is the last name as well as the forename.