Last name 洞泉 (洞泉 
) , around the globe, is a very rare family name. The family name 洞泉 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 洞泉 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 洞泉 | China |