Family name Gasen (Gasen 
) , all around the world, is a rare surname. The cognomen Gasen is characteristic of the Democratic Republic of the Congo, where it is a rare surname, France, where it is a very rare surname, and Spain. Not in comparison with a country's population, the name is most common in the Democratic Republic of the Congo, Brazil, and France. More prevalently, Gasen is the forename as well as the last name.