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Family name 服部 (Hattori , 服部 , Nankaku ) , in all the world, is quite a rare last name. The surname 服部 is characteristic of Guam, where it is quite a common surname, Japan, where it is a rare surname, and Singapore. In absolute terms, the name is most common in Japan, Brazil, and the United States. Very seldom, 服部 is the forename as well as the last name.