Cognomen Renser (Renser 
) , all over the world, is a very rare last name. The cognomen Renser is characteristic of Estonia, where it is quite a rare surname, Chile, where it is an extremely rare surname, and Germany. Not in comparison with a country's population, this name is the most popular in Estonia, Germany, and France. Very seldom, Renser is the forename as well as the last name.