Cognomen 加俊 (Jiajun 
, 加俊 ) , globally, is quite a rare last name. The cognomen 加俊 is characteristic of Singapore, where it is quite a rare surname, Taiwan, where it is a rare surname, and Malaysia. In absolute terms, this name is the most popular in China, Taiwan, and Malaysia. More prevalently, 加俊 is the forename as well as the last name.