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Family name Masaki (マサキ , 敦 , Masaki ) , across the world, is a widespread last name. The surname Masaki is characteristic of Japan, where it is quite a common surname, Tanzania, where it is quite a rare surname, and Kenya. Measured by absolute frequency, the name is most common in Japan, China, and Tanzania. Much less frequently, Masaki is the forename as well as the last name.