Cognomen Duenchai (Duenchai 
) , across the world, is an extremely rare last name. The cognomen Duenchai is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more frequently, Duenchai is the forename as well as the last name.
Siya, Wright, Kordkam, Yuktanon, Chaisiri, Khamamnouy, Yuktanonda, Udomsaree, Kraichoke, Teerakumjai, Jaturongmanoporn, Taechasinchai, Nuamthanom, and Chantharaksa