Cognomen Монсен (Monsen 
, Монсен 
) , throughout the world, is quite a rare last name. The family name Монсен is habitual in Northern Europe, particularly Norway, where it is quite a common surname, Denmark, where it is quite a rare surname, and Iceland. In absolute terms, it most frequently occurs in Norway, the United States, and Denmark. Very seldom, Монсен is the forename as well as the last name.