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Family name Roost (Roost , Руст , ロースト) , globally, is quite a rare last name. The last name Roost is habitual in Estonia, where it is quite a common surname, Switzerland, and Belgium, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Western Europe, particularly Switzerland, Belgium, and Germany. Much less frequently, Roost is the forename as well as the last name.