Family name Astun (Astun 
) , in the world, is a rare surname. The family name Astun is habitual in Latin America and the Caribbean, particularly Guatemala, where it is a rare surname, Honduras, and Argentina. Not in comparison with a country's population, this name is the most popular in Latin America and the Caribbean, particularly Guatemala, Brazil, and Argentina. Also, Astun is the forename as well as the last name.