Surname สมรัตน์ (Somrat 
, สมรัตน์ ) , throughout the world, is quite a common last name. The family name สมรัตน์ is habitual in Bangladesh, where it is quite a rare surname, Oman, and Qatar. Not in comparison with a country's population, it is commonest in Bangladesh, Thailand, and Saudi Arabia. Likewise, สมรัตน์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Somrat | Thailand, Bangladesh, Saudi Arabia, Oman, India |
| สมรัตน์ | Thailand |