Cognomen Wiwat (วิวัฒน์ 
, Wiwat 
, วิวรรธน์ ) , in the entire world, is a rare surname. The cognomen Wiwat is habitual in Thailand, where it is quite a rare surname, Malaysia, where it is a very rare surname, and Canada. Measured by absolute frequency, it is commonest in Thailand, China, and Indonesia. Much more frequently, Wiwat is the forename as well as the last name.
Satou, Samanchat, Kulsirinithiphat, Roongkaew, Duanrungrueangkul, Hanvongjirawat, Homcharoen, Wongwiwat, Siwapornanan, Surapattana, Srithaiyingjaroen, Chaiviriya, Kamchamnan, Pattanawong, Panjamanoj, Dumrongchat, Tangprasopchot, Thammasitboon, Sugandhajati, Chiamvitayanukul, Damrongkulnan, Thongchaiprasit, Horbanluekit, Thammata, Tayanuwat, Lertwiwatwongsa, Suklar, Noomak, Chamram, Chunruksa, Banpata, Kaewkla, Promdee, Rodkerd, Rittima, Darakai, Thongsongsom, Waiwong, Sorasermsombat, Chitnuan, Chiamsaranuwat, Chidcherdwong, Bulanawatanakul, Khamphat, Pangyota, Prampring, Prempaiboon, Pimpakan, Makkitham, and Kittipornpanich