Family name Troun (Trone 
, Troun 
, Thronus ) , across the world, is quite a rare last name. The surname Troun is characteristic of Reunion, where it is quite a common surname, Latvia, where it is a rare surname, and the United States. Measured by absolute frequency, this name is the most popular in the United States, Reunion, and Indonesia. Much less frequently, Troun is the forename as well as the last name.