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Family name Hiyu (Hiyu ) , in the world, is a very rare surname. The family name Hiyu is characteristic of South-eastern Asia, particularly Malaysia, where it is a rare surname, Singapore, where it is a very rare surname, and Philippines, where it is an extremely rare surname. In absolute terms, it most frequently occurs in Malaysia, China, and Singapore. Much more frequently, Hiyu is the forename as well as the last name.