Surname Sangju (Sangju 
, แสงจู 
) , in all the world, is a rare family name. The surname Sangju is characteristic of South Korea, where it is a rare surname, Thailand, where it is a very rare surname, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, this name is the most popular in South Korea, Thailand, and China. Likewise, Sangju is the forename as well as the last name.