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