Family name สมราช (Somrat 
, Somraj 
, สมราช ) , in all the world, is quite a common surname. The cognomen สมราช is habitual in Bangladesh, where it is quite a rare surname, Oman, and Qatar. Measured by absolute frequency, the name is most common in Bangladesh, Thailand, and Saudi Arabia. Likewise, สมราช is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Somrat | Saudi Arabia, India, Thailand, Bangladesh, Oman |
| Somraj | Saudi Arabia, Nepal, India, Thailand, Qatar |
| สมราช | Thailand |