Cognomen Sinouan (Sinouan 
) , in the world, is a rare family name. The last name Sinouan is characteristic of Laos, where it is quite a rare surname, Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Sinouan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sinouan | United States, Laos, Canada, Thailand |