Cognomen Kayaiwong (Kayaiwong 
) , in all the world, is a very rare family name. The family name Kayaiwong is characteristic of Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname.
Amnat, Aumnat, Soomboon, Boonnicha, Peerawat, Prathana, Napasorn, Primprapha, Phatchaya, and Mongkolthiwat