Surname 真司 (Shinji 
, 真司 ) , throughout the world, is quite a common last name. The family name 真司 is habitual in Japan, where it is quite a rare surname, Taiwan, and Tanzania, where it is a rare surname. Measured by absolute frequency, the name is most common in Japan, China, and Indonesia. Likewise, 真司 is the forename as well as the last name.