Surname Йонсен (Johnsen 
, Joensen , Йонсен 
) , all around the world, is a common cognomen. The last name Йонсен is habitual in Norway, where it is a common surname, Denmark, where it is quite a common surname, and Greenland (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in Norway, the United States, and Denmark. Much less frequently, Йонсен is the forename as well as the last name.