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Last name Rosenn (罗森 , Rosenn , רוזן) , globally, is a very rare cognomen. The family name Rosenn is characteristic of the United States, where it is a very rare surname, Israel, and China, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in China, the United States, and Nigeria. More frequently, Rosenn is the forename as well as the last name.