Cognomen Tàn (Tàn 
) , in all the world, is a rare family name. The cognomen Tàn is characteristic of Algeria, where it is a rare surname, and Vietnam, where it is a very rare surname. Very seldom, Tàn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tàn | Algeria, Vietnam |