Cognomen Phitthaya (พิทยา 
, Phitthaya 
) , around the world, is a very rare surname. The family name Phitthaya is habitual in Norway, where it is a very rare surname, and Thailand. Predominantly, Phitthaya is the forename as well as the last name.
Anan, Chooklin, Chuthong, Kanchana, Promchan, Phudensai, Taraboot, Nookongbut, Wanakonkhachonchip, Wamakhan, Yongyuen, Sawangkul, Chairiang, Kaewpanya, Phruettirat, Duangtadum, Thuraphat, Sanohdontree, Kaeoyotkhao, Parinyarot, Thepwichian, Mongkhonbut, Chinphon, Chantiya, Sianthong, Saephang, Atthi, Bunla, Yammi, Saelai, Siphop, Sukhon, Aiapaiboon, Paphan, Phibun, Hakham, Chomphunoot, Boonyao, Khiaosi, Panthoi, Pilaisomboon, Phaefuang, Phromma, Thongmi, Tosuwan, Watjang, Wongman, Yawikham, Khongha, and Rungrattanasakunchai