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Last name Hirayama (ヒラヤマ , 平山 , Hirayama ) , all around the world, is quite a rare family name. The cognomen Hirayama is habitual in Singapore, where it is a rare surname, Japan, and Switzerland. In absolute terms, it is commonest in China, Japan, and Brazil. More prevalently, Hirayama is the forename as well as the last name.