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