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