Last name Couler (Colare 
, Couler 
) , in all the world, is a very rare surname. The surname Couler is characteristic of Argentina, where it is a very rare surname, the United Kingdom, where it is an extremely rare surname, and the United States. Not in comparison with a country's population, it most frequently occurs in Argentina, the United States, and Brazil. Much less frequently, Couler is the forename as well as the last name.