Last name สมรัช (Somrat 
, สมรัช , Somratch ) , around the globe, is quite a common cognomen. The cognomen สมรัช 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. Also, สมรัช is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Somrat | Thailand, Oman, Saudi Arabia, India, Bangladesh |
| Somratch, สมรัช | Thailand |
สินงาม, หนูมี, อุยานนทรักษ์, ทัศนาลัย, and หิรัญยะวะสิต