Surname Нилсен (Nielsen 
, Nilsen , Nylsen 
) , in all the world, is a widespread last name. The family name Нилсен is habitual in 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, the name is most common in Denmark, the United States, and Norway. Much less frequently, Нилсен is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nilsen, Nielsen | Norway, Sweden, United States, Germany, Denmark |
| Nylsen | Mexico, Brazil, Venezuela, United States, Chile |
| Нилсен | Russia |