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Last name Jirō (二郎 , ジロウ , جيرو ) , all over the world, is a common surname. The cognomen Jirō is habitual in Japan, where it is quite a rare surname, Syria, where it is a rare surname, and Sudan. In absolute terms, it most frequently occurs in Japan, Syria, and China. Much less frequently, Jirō is the forename as well as the last name.