Cognomen Udomlak (Udomlak 
) , in the entire world, is a very rare surname. The cognomen Udomlak is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much more frequently, Udomlak is the forename as well as the last name.
Yaso, Thonglor, Thurapaeng, Nuanchan, Visarnkij, Matsathit, Srisujarit, Srichanta, Chanwimol, Cheenchay, Paichamnan, Jindaphol, Thanmanon, Thongthip, Nontakote, Unchittikul, Saengsamphan, Kongprasom, Tanapaparphat, Thammateradusadee, Niwasabutra, Saengkhlaijaroen, Thaosakul, Khotsing, Boonanan, Chaiyarn, Saevgun, Sowden, Bunsuk, Kulnil, Phirak, Ratana, Tueyjanthuk, Monkong, Sakkaew, Saengun, Bumrungsawat, Sritusnee, Boonsai, Boonket, Kanyama, Dejesus, Thiprat, Namkaew, Onlamai, Wongwan, Methakeson, Suksanit, Bangmad, and Thanakamalapradit