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