Cognomen Silsan (Silsan 
) , worldwide, is a very rare surname. The cognomen Silsan is characteristic of Thailand, where it is a very rare surname, Mexico, where it is an extremely rare surname, and Brazil. In absolute terms, it most frequently occurs in Thailand, India, and Mexico. More prevalently, Silsan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Silsan | India, Thailand, Spain, Philippines, Brazil |