Family name พรหมขจร (พรหมขจร 
, Promkajhon , Promkhajorn ) , all around the world, is a rare surname. The last name พรหมขจร is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, พรหมขจร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Promkajhon, พรหมขจร, Promkhajorn, Phomkajhon | Thailand |
Promkajon, Promkajorm, and Promkajorn