Cognomen Нільсен (Nielsen 
, Nilsen , Нільсен 
) , worldwide, is a widespread last name. The cognomen Нільсен is characteristic of Denmark, where it is a prevalent surname, Greenland, and Norway, where it is a widespread surname (explore the name in all countries). Measured by absolute frequency, it is commonest in Denmark, the United States, and Norway. Very seldom, Нільсен is the forename as well as the last name.