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