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Cognomen Roosa (Руса , روزا , Roosa ) , throughout the world, is a common last name. The last name Roosa is habitual in Bulgaria, where it is a common surname, Estonia, where it is quite a rare surname, and Libya. Not in comparison with a country's population, it is commonest in Bulgaria, the United States, and Egypt. Likewise, Roosa is the forename as well as the last name.