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Last name Hirahara (平原 , ヒラハラ , Hirahara ) , worldwide, is quite a rare cognomen. The last name Hirahara is characteristic of China, where it is a rare surname, Singapore, and the United States, where it is a very rare surname. Not in comparison with a country's population, it is commonest in China, the United States, and Brazil. More prevalently, Hirahara is the forename as well as the last name.