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Family name Hirao (ヒラオ , Hirao , 소 ) , globally, is a common cognomen. The family name Hirao is habitual in South Korea, where it is quite a common surname, Japan, where it is a rare surname, and Switzerland. In absolute terms, this name is the most popular in South Korea, Japan, and Philippines. Also, Hirao is the forename as well as the last name.