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Family name 昌之 (Masayuki , 昌之 ) , across the world, is quite a common surname. The surname 昌之 is habitual in 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, it is commonest in Eastern Asia, particularly Japan, China, and Taiwan. Also, 昌之 is the forename as well as the last name.