Last name 正嗣 (Masatsugu 
, 正嗣 ) , throughout the world, is a rare surname. The cognomen 正嗣 is habitual in Japan, where it is a rare surname, Hong Kong, and Belgium, where it is a very rare surname. In absolute terms, this name is the most popular in Japan, China, and the United States. Very seldom, 正嗣 is the forename as well as the last name.