Cognomen แลน (Lan 
, Landan 
, Laen 
) , globally, is a widespread surname. The last name แลน is habitual in Malaysia, where it is a common surname, Macao, and Vietnam, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in China, Malaysia, and Vietnam. Much less frequently, แลน is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Lan | Malaysia, China, Indonesia, Vietnam, Myanmar |
| Landan | Malaysia, China, Indonesia, India, United States |
| Laen | Malaysia, Indonesia, India, Iraq, United States |
| แลน | Thailand |