Family name 渭兰 (渭兰 
) , in the entire world, is a very rare cognomen. The last name 渭兰 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More frequently, 渭兰 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 渭兰 | China |