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Last name Hirokazu (博一 , Hirokazu , ヒロカズ ) , worldwide, is a common family name. The family name Hirokazu is habitual in Japan, where it is quite a common surname, Taiwan, where it is a rare surname, and Belgium. Not in comparison with a country's population, it is the most numerous in Eastern Asia, particularly Japan, China, and Taiwan. Very seldom, Hirokazu is the forename as well as the last name.