Last name Thitachaiyarojn (Thitachaiyarojn 
) , globally, is an extremely rare family name. The cognomen Thitachaiyarojn is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thitachaiyarojn | Thailand |
Pimladar, and Pooncharas