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