Last name Wairojjana (Wairojjana 
) , in the entire world, is a very rare cognomen. The surname Wairojjana is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Wairojjana | Thailand |
| nopparat wairojjana Ph.D. King Mongkut's University of Technology Thonburi 2014 |
|
Praewpisut, and Ploynatcha