Cognomen روست (Rost 
, Rust , Roost ) , around the globe, is a common last name. The surname روست is habitual in Germany, where it is quite a common surname, Switzerland, and Namibia (explore the name in all countries). In absolute terms, it most frequently occurs in Germany, the United States, and the United Kingdom. Much less frequently, روست is the forename as well as the last name.