Cognomen Rymbu (Рымбу 
, Rymbu 
) , around the world, is a very rare last name. The surname Rymbu is characteristic of Lithuania, where it is a rare surname, Kazakhstan, and Denmark, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Russia, Kazakhstan, and Lithuania. Very seldom, Rymbu is the forename as well as the last name.