Worldwide, สมจา (สมจา 
) is a very rare mostly boy's, but infrequently feminine first name. The forename สมจา is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare mostly masculine, but uncommonly feminine name. Likewise, สมจา is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| สมจา | Thailand |