Cognomen Pairojn (Pairojn 
) , globally, is a very rare surname. The last name Pairojn is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, Pairojn is the forename as well as the last name.
Nonsila, Umpuntong, Tantiwaja, Thanthum, Wilaitrakul, Markmaitri, Paisalsak, Piphatrojanakamol, Leelasrichai, Tangarsasilp, Tantiwacha, and Anantakunupakorn