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Cognomen Rosenbaum (Rosenbaum , Розенбаум , רוזנבאום ) , in all the world, is a common surname. The surname Rosenbaum is characteristic of Israel, where it is quite a common surname, Germany, where it is quite a rare surname, and Czechia. Measured by absolute frequency, it is commonest in the United States, Germany, and Israel. Very seldom, Rosenbaum is the forename as well as the last name.