Last name Луен (Luyen 
, Luen 
, Louen 
) , all over the world, is a common surname. The cognomen Луен is habitual in Malaysia, where it is quite a common surname, Taiwan, and Macao, where it is quite a rare surname. In absolute terms, it is the most numerous in Malaysia, Taiwan, and Vietnam. Very seldom, Луен is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Luyen | Malaysia, China, Vietnam, United States, Taiwan |
| Luen | Malaysia, China, Vietnam, Hong Kong, Taiwan |
| Louen | Germany, Philippines, France, Malaysia, United States |
| Луен | Russia |