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In all the world, Hiraiwa (平岩 , Hiraiwa
) is a rare principally male, but scarcely girly forename. The first name Hiraiwa is characteristic of Eastern Asia, particularly China, where it is a very rare predominantly boy's, but very seldom girly name. Likewise, Hiraiwa is the last name as well as the forename.
Hiraiwa is also a name for the fictitious and mythical characters: .