Surname พจน์เสถียรกุล (พจน์เสถียรกุล 
) , in the entire world, is a very rare family name. The last name พจน์เสถียรกุล is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| พจน์เสถียรกุล | Thailand |