Family name Uaychai (Uaychai 
) , in all the world, is a very rare cognomen. The cognomen Uaychai is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, Uaychai is the forename as well as the last name.
Inta, Ruttanawong, Chotkittikul, Vadisirisak, Netsaengsri, Lertsuwankul, Panichchakan, Kliangklom, Kliengklom, Sriboonchou, Leekhasawas, Sukanalam, Treechot, Chaithongrat, Phothong, Keowsanmanee, Foythong, Hansung, Niamkul, Poosoda, Saeueng, Saejung, Jullao, Raegthaisong, Buamat, Innak, Wata, Poowarat, and Thipthanakan