In the entire world, 衍寅 (衍寅 
) is a very rare male given name. The given name 衍寅 is habitual in Eastern Asia, particularly China, where it is an extremely rare male name. Very seldom, 衍寅 is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| 衍寅 | China |