Cognomen Kjellen (Kjellen 
) , all around the world, is a rare last name. The cognomen Kjellen is characteristic of Sweden, where it is quite a rare surname, Norway, where it is a rare surname, and New Zealand, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Sweden, Norway, and the United States. Very seldom, Kjellen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kjellen | United Kingdom, Norway, United States, Sweden, India |