Cognomen สอนชัย (Sonchai 
, สอนชัย ) , around the world, is a rare last name. The surname สอนชัย is habitual in Thailand, where it is quite a rare surname, Malaysia, where it is an extremely rare surname, and the United Kingdom. Not in comparison with a country's population, it is the most numerous in Thailand, China, and Malaysia. Also, สอนชัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sonchai | Thailand, United Kingdom, India, United States, China |
| สอนชัย | Thailand |