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Cognomen チヒロ (Chihiro , チヒロ , Tihiro ) , around the globe, is a common last name. The cognomen チヒロ is habitual in Japan, where it is quite a common surname, Indonesia, where it is a very rare surname, and Vietnam. In absolute terms, it is commonest in Japan, China, and Indonesia. Very seldom, チヒロ is the forename as well as the last name.