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