Cognomen Kulchaya (Kulchaya 
) , around the world, is an extremely rare surname. The cognomen Kulchaya is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more frequently, Kulchaya is the forename as well as the last name.
Loyha, Sirajaras, Sribourod, Chaleaykrai, Buntachit, Kasamakorn, Prachumkul, Purikitikornkul, Rungmanee, Thongthip, Traitanakorn, Warapirangkurn, Wiriyakit, Suriyachai, Suwannawin, Srichavanant, Khansoongnoen, Pettersson, Prayoonsak, Deewongsai, Traithanakorn, Wattanakul, Sirajarus, Sawatwong, Maneechot, Wongpong, Saejia, Pradoo, Tanong, Sinchai, Kooariyakul, Petmunee, Tansiri, Titastit, Nilpetch, Nonthree, Siripaphawee, Ornontanatkul, Siwakanvanit, Settasook, Kritsriprapakorn, Pornlamai, Luangyawee, Janpratiw, Thippeng, Titasiti, Vinagupta, Waenkaeo, Wathana, and Thianpattanakul