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