Cognomen Erramun (Erramun 
) , around the world, is a very rare last name. The last name Erramun is habitual in Uruguay, where it is a rare surname, Italy, where it is an extremely rare surname, and Peru. Not in comparison with a country's population, it is the most numerous in Uruguay, Brazil, and Italy. Also, Erramun is the forename as well as the last name.