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