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Cognomen 正行 (Masayuki , 正行 ) , across the world, is quite a common last name. The cognomen 正行 is characteristic of Japan, where it is quite a rare surname, Taiwan, and Singapore, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Eastern Asia, particularly Japan, China, and Taiwan. Likewise, 正行 is the forename as well as the last name.