Across the world, Ontha (Ontha 
) is a very rare unisex given name. Much more frequently, Ontha is the last name as well as the forename.
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