Cognomen Sihachan (Sihachan 
) , around the world, is an extremely rare family name. The cognomen Sihachan is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, Sihachan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sihachan | Thailand, United States |