Family name Россум (Rossum 
, Россум 
, Røssum 
) , around the globe, is quite a common surname. The cognomen Россум is habitual in Western Europe, particularly Netherlands, where it is quite a common surname, Belgium, where it is quite a rare surname, and Switzerland. Not in comparison with a country's population, it most frequently occurs in Netherlands, Belgium, and the United States. Much less frequently, Россум is the forename as well as the last name.