Family name ศิวราช (Sivaraj 
, ศิวราช 
) , all around the world, is quite a rare last name. The cognomen ศิวราช is habitual in Sri Lanka, where it is quite a rare surname, United Arab Emirates, and Qatar. Not in comparison with a country's population, the name is most common in India, Sri Lanka, and Malaysia. More prevalently, ศิวราช is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sivaraj | Saudi Arabia, Malaysia, India, Sri Lanka, United Arab Emirates |
| ศิวราช | Thailand |