Cognomen Phetphailin (Phetphailin 
) , in all the world, is an extremely rare surname. Much more frequently, Phetphailin is the forename as well as the last name.
Sisan, Wongsukkamon, Pongrangsri, Panchachom, Yammaneechai, Thonganan, Louhenapessy, Phetnuntho, Phongsounthone, Kunachaiprasert, Anurakbandit, Sengsawat, Osotsapa, Thitapura, Thaikoed, Junlasat, Phuthapthim, Mahabudwong, Yingyot, Wasuwat, Keomixay, Bunin, Sichanthavong, and Watthanapradit