Family name Yoou (คุณ 
, 洋宇 
, Yoou 
) , in the world, is a rare last name. The surname Yoou is characteristic of South Korea, where it is a rare surname, Malaysia, and Egypt, where it is a very rare surname. In absolute terms, this name is the most popular in South Korea, China, and Egypt. More frequently, Yoou is the forename as well as the last name.