Cognomen Lennartson (Lennartson 
) , worldwide, is a rare family name. The last name Lennartson is characteristic of Sweden, where it is a rare surname, the United States, where it is a very rare surname, and Norway. Not in comparison with a country's population, the name is most common in the United States, Sweden, and the United Kingdom.
| VARIANT | COUNTRY |
|---|---|
| Lennartson | Norway, United Kingdom, Sweden, United States |
Lennartsson, and Lennerthson