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Family name Масаюки (Masayuki , Масаюки ) , in the world, is quite a common cognomen. The cognomen Масаюки is characteristic of Japan, where it is quite a rare surname, Taiwan, and Singapore, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Eastern Asia, particularly Japan, China, and Taiwan. Likewise, Масаюки is the forename as well as the last name.