Cognomen Koosuwan (Koosuwan 
) , all around the world, is a rare last name. The surname Koosuwan is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname, and Indonesia, where it is a very rare surname.
Kom, Pacharaporn, Pattanachat, Wongsakkorn, Theerasak, Pacharporn, Khiangsak, Kaweewong, Vibulsak, Jiraporn, Ratikorn, Kritsada, Kritsana, Kornphol, Chidphan, Harikan, Nattaya, Tanawat, Julthida, Piyawat, Penchan, Kedwalee, Kornwika, Kanokkwan, Supanee, Wanida, Ekapol, Kerkul, Arporn, Waris, Prapatsorn, and Warinthorn