Family name Rosus (Rosus 
) , all over the world, is a rare last name. The cognomen Rosus is characteristic of Romania, where it is quite a rare surname, Austria, where it is a rare surname, and Canada, where it is an extremely rare surname. In absolute terms, this name is the most popular in Romania, Austria, and the United States. Very seldom, Rosus is the forename as well as the last name.