Surname 旦 (旦 
, 단 
, Dàn 
) , all over the world, is a common last name. The cognomen 旦 is characteristic of South Korea, where it is quite a rare surname, China, and Morocco, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in China, South Korea, and Myanmar. Likewise, 旦 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 旦 | China |
| 단 | South Korea |
| Dàn | Myanmar, Morocco, Vietnam, China, Algeria |