Cognomen 正幸 (Masayuki 
, 正幸 ) , around the globe, is quite a common last name. The last name 正幸 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, 正幸 is the forename as well as the last name.