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