Cognomen Tuu (Tuu 
) , in all the world, is quite a common last name. The cognomen Tuu is habitual in Myanmar, where it is quite a rare surname, Hungary, and Malaysia, where it is a rare surname. Measured by absolute frequency, this name is the most popular in South-eastern Asia, particularly Myanmar, Malaysia, and Indonesia. Much less frequently, Tuu is the forename as well as the last name.