Cognomen 兰孙 (兰孙 
) , all over the world, is a very rare surname. The last name 兰孙 is characteristic of Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 兰孙 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 兰孙 | China |