Cognomen Kaewsai (Kaewsai 
) , worldwide, is quite a rare last name. The family name Kaewsai is habitual in Thailand, where it is quite a rare surname, Malaysia, where it is an extremely rare surname, and the United Kingdom. Not in comparison with a country's population, the name is most common in Thailand, the United States, and Malaysia. Much less frequently, Kaewsai is the forename as well as the last name.
Aun, Amnuay, Aunnop, Aticha, Apinan, Apirom, Apiwit, Chalit, Bangon, Pawina, Prawat, Putana, Dolsak, Duenpen, Jariya, Narong, Nattha, Ekamol, Vaewadee, Orapin, Orawan, Wanpen, Areeya, Anuwat, Alison, Sophon, Aom, Anek, Aree, Chut, Krit, Suwat, Sopon, Alisa, Araya, Amorn, Mantana, Aswin, Pituk, Pipat, Jinda, Waree, Wasan, Yuree, Mintra, Sombat, Somsri, Somkid, Kamol, and Montree