Surname Dàn (旦 
, Dàn 
) , all over the world, is a common cognomen. The last name Dàn is characteristic of China, where it is quite a rare surname, Morocco, where it is a very rare surname, and Myanmar. In absolute terms, it is the most numerous in China, Myanmar, and Vietnam. Likewise, Dàn is the forename as well as the last name.