Family name Туван (Tovan 
, Туван 
) , in all the world, is a rare surname. The family name Туван is habitual in Norway, where it is a rare surname, Indonesia, and Vietnam, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Indonesia, Norway, and the United States. More frequently, Туван is the forename as well as the last name.