Worldwide, לאסן (Lacen 
, Lassen 
, Lasn 
) is a rare boy's first name. The given name לאסן is habitual in Algeria, where it is a rare masculine name, Morocco, and the United States, where it is an extremely rare unisex name. Not in comparison with a country's population, it is commonest in Algeria, Morocco, and China. More frequently, לאסן is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Lacen | Brazil, Morocco, United States, Germany, Algeria |
| Lassen | Norway, Brazil, United States, Germany, Denmark |
| Lasn | United States, Estonia, Canada |
| לאסן | Israel |