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Cognomen Hirano (ヒラノ , Hirano , 平野 ) , in the entire world, is quite a common surname. The cognomen Hirano is characteristic of Hong Kong, where it is quite a rare surname, Japan, and Singapore. Not in comparison with a country's population, it most frequently occurs in Japan, Brazil, and the United States. More prevalently, Hirano is the forename as well as the last name.