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 | Germany, Morocco, Brazil, United States, Algeria |
| Lassen | Denmark, Germany, Norway, Brazil, United States |
| Lasn | Canada, United States, Estonia |
| לאסן | Israel |