Family name Wongchai (Wongchai 
, วงศ์ใจ , วงษ์ฉาย ) , globally, is quite a common surname. The family name Wongchai is characteristic of Thailand, where it is quite a rare surname, and the United States, where it is an extremely rare surname.
Ms, Malai, Merin, Santi, Saman, Samai, Sulah, Supha, Sutat, Sutee, Manit, Suwat, Kanta, Kulab, Pinit, Pimon, Phong, Punsa, Danai, Ladda, Janya, Arnon, Manat, Marut, Maree, De, Yo, Muk, Ann, Bua, Gam, Lak, Nop, Sula, Sopa, Chai, Kham, Krit, Pani, Pang, Dach, Napa, Nida, Nual, Opas, Yupa, Tanya, and Tawan