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Surname Shintarō (Shintaro , Shintarō ) , all around the world, is a rare last name. The last name Shintarō is characteristic of Singapore, where it is a rare surname, Indonesia, and Japan, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Indonesia, China, and Japan. Also, Shintarō is the forename as well as the last name.