Surname Ruethai (Ruethai 
) , in the world, is a very rare last name. The family name Ruethai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much more frequently, Ruethai is the forename as well as the last name.
Mala, Dannirapai, Laungthep, Trayangkul, Nilprakobkul, Saengphan, Srisangtong, Charunrat, Khongphat, Doungchan, Jarusombat, Thammatien, Thammaloka, Teanthongdee, Supaksirikul, Somboonsin, Prasitsuwan, Lertkiatidamrong, Jansingkhorn, Narintranggoolnaayut, Nuamcharoen, Worawongsa, Ragsaket, Phongsri, Koonvisal, Kaewdang, Utra, Orton, Onnom, Srisuk, Allard, Rodpai, Nualhun, Ongmon, Chaikla, Chaiman, Rungrotchanaluk, Chaijak, Ketpong, Pairoad, Puektal, Laongtep, Wangpol, Wattana, Saiyawan, Chanakul, Chakkhuphan, Bandhaya, Boonudsaha, and Tantipongsa