Family name Saiwaeo (สายแวว 
, Saiwaeo , سياوي 
) , all over the world, is quite a rare surname. The family name Saiwaeo is habitual in Thailand, where it is quite a rare surname, and Iran, where it is a very rare surname. Much less frequently, Saiwaeo is the forename as well as the last name.
Poi, Kruakaew, Pornnapa, Nutjarin, Sukhontip, Chatuphon, Chayaporn, Choedchamrun, Chuthamat, Kannapat, Bunrueang, Kiatprawut, Kiadtisak, Ruethaitip, Jittakorn, Natthamon, Wannasiri, Boonrueang, Phikunthong, Khrueathip, Jiratchaya, Monnapha, Tongdam, Pha, Mipha, Sanya, Anong, Chali, Chuen, Wipha, Suthin, Malichan, Somkid, Bungon, Niphan, Vanida, Muanfan, Sawaeng, Chopboribun, Pakjira, Phatkiatkhachon, Somjai, and Chaloemchai