Last name สนธิรัตน์ (สนธิรัตน์ 
, Sonthirat , Sontarat 
) , all around the world, is a rare cognomen. The last name สนธิรัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Likewise, สนธิรัตน์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sonthirat, สนธิรัตน์ | Thailand |
| Sontarat | India, Thailand |
| Sontirat | United States, Thailand |
Sarntirat, Sondhirat, Sondhiratne, Sonthiratana, Sonthirath, Sontiratana, and Sontirath