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Family name Masanobu (正信 , Masanobu , マサノブ ) , all around the world, is a common cognomen. The last name Masanobu is characteristic of Japan, where it is quite a common surname, Taiwan, where it is a rare surname, and Cambodia. Measured by absolute frequency, it most frequently occurs in Eastern Asia, particularly Japan, China, and Taiwan. Very seldom, Masanobu is the forename as well as the last name.