Cognomen Ронген (Rongen 
, Ронген 
) , around the world, is quite a rare last name. The family name Ронген is characteristic of Netherlands, where it is quite a rare surname, Norway, where it is a rare surname, and Germany. Measured by absolute frequency, it is the most numerous in Netherlands, Germany, and Australia. Also, Ронген is the forename as well as the last name.