Cognomen Phiangjai (Phiangjai 
, Phiangijai) , around the globe, is a very rare last name. The family name Phiangjai is habitual in South-eastern Asia, particularly Malaysia, where it is a very rare surname, and Thailand. More frequently, Phiangjai is the forename as well as the last name.
Loo, Benjaputtarak, Songthangtum, Youngwitthayakul, Tangtrongmit, Rungrueang, Parinyaweerakul, Chansamakr, Thongsalee, Roonnapak, Raksatham, Promchaem, Yueangkrathok, Juangjan, Jairatsuksri, Janthanaphong, Poomueng, Barnhill, Hoisang, Nokkaew, Lawakul, Boonsuk, Chaisim, Trisri, Jitsin, Porsai, Sripan, Wieck, Sisan, Merod, Baal, Kamonsri, and Ratanachaikun