Family name พิชัญเธียรชัย (พิชัญเธียรชัย 
) , all over the world, is a very rare cognomen. The cognomen พิชัญเธียรชัย is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| พิชัญเธียรชัย | Thailand |