Family name Siyaraj (Siyaraj 
) , in the entire world, is an extremely rare cognomen. The last name Siyaraj is characteristic of Southern Asia, particularly India, where it is an extremely rare surname. Much more prevalently, Siyaraj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siyaraj | India, Thailand |