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Surname 丹羽 (Niwa , 丹羽 , Danyu ) , in all the world, is quite a rare last name. The last name 丹羽 is characteristic of Isle of Man, where it is quite a rare surname, New Zealand, where it is a rare surname, and Singapore. In absolute terms, this name is the most popular in Indonesia, Japan, and China. Likewise, 丹羽 is the forename as well as the last name.