Around the globe, สมจัย (สมจัย 
) is a very rare epicene first name. The first name สมจัย is habitual in South-eastern Asia, particularly Thailand, where it is a very rare epicene name. Much less frequently, สมจัย is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| สมจัย | Thailand |