Cognomen ลืน (Luen 
, ลืน 
) , around the world, is a common last name. The last name ลืน is habitual in Taiwan, where it is quite a common surname, Malaysia, and Hong Kong, where it is quite a rare surname. Much less frequently, ลืน is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Luen | China, Malaysia, Hong Kong, Taiwan, Myanmar |
| ลืน | Thailand |