Family name Sián (贤 
, 賢 , Sián 
) , across the world, is a common cognomen. The last name Sián is characteristic of China, where it is quite a rare surname, and Guatemala. More prevalently, Sián is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 賢, 贤 | China |
| Sián | Argentina, Guatemala, United Kingdom, South Africa |
| sián diana gibson-watt (born 1962) (b. 1962) |
|