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