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Worldwide, Hirokazu (博一 , Hirokazu , ヒロカズ ) is quite a rare boy's first name. The forename Hirokazu is characteristic of Japan, where it is a rare masculine name, China, where it is a very rare principally boy's, but scarcely girly name, and Indonesia, where it is a very rare boy's name. More prevalently, Hirokazu is the last name as well as the forename.
Hirokazu is also a name for the fictitious and mythical characters: Hirokazu Shioda , the Digimon character, Digimon Tamers.