Cognomen Lassenius (Lassenius 
) , in the world, is a rare last name. The family name Lassenius is characteristic of Northern Europe, particularly Finland, where it is quite a rare surname, Sweden, where it is a rare surname, and Denmark. Much less frequently, Lassenius is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Lassenius | Sweden, Finland, Germany, Denmark, Spain |
|
johannes lassenius German author and theologian, DE (b. 1636) |
|
| mauritz lassenius (b. 1865) |
|
|
| torbjörn lassenius Finnish decathlete, FI (b. 1931) |
|
|
| johannes lassenius |
|
|
| casper lassenius |
|
|
| pieter lassenius |
|
|
| fredrik lassenius |
|
|
| yvonne lassenius FI |
|