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Last name Kiyohara (清原 , Kiyohara ) , in all the world, is a rare family name. The family name Kiyohara is habitual in Hong Kong, where it is quite a rare surname, Peru, where it is a very rare surname, and Japan. In absolute terms, the name is most common in Brazil, China, and Japan. Likewise, Kiyohara is the forename as well as the last name.