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