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Family name Aihara (アイハラ , Aihara , あいはら) , all around the world, is quite a rare surname. The surname Aihara is habitual in Hong Kong, where it is a rare surname, Japan, and Singapore. Measured by absolute frequency, this name is the most popular in Indonesia, Brazil, and Japan. More frequently, Aihara is the forename as well as the last name.