Cognomen Ontha (Ontha 
) , across the world, is a rare surname. The family name Ontha is habitual in Saudi Arabia, where it is a rare surname, United Arab Emirates, and Thailand, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Saudi Arabia, Indonesia, and Thailand. Much less frequently, Ontha is the forename as well as the last name.
Lak, Wishnu, Samruam, Shomokh, Sumalee, Kebriaa, Goonoon, Nonglak, Harish, Onthatile, Kitsanat, Prestige, Yaowalak, Supitsara, Krittheera, Rungrudee, Wuttichai, Bountymer, Sammanat Archasak, Kbryaa, Kabrya, Samt, Rmad, Gror, Gnon, Jnon, Naly, Shmok, Kebria, Ahsas, Groor, Jonon, Jnoon, Ehsas, Shmook, Shmokh, Anuwat, Kayan, and Pathompong