Surname Umasa (Umasa 
, อูมาสะ , อุมาสะ ) , in all the world, is a rare family name. The family name Umasa is characteristic of Thailand, where it is a rare surname, Saudi Arabia, and Malaysia, where it is an extremely rare surname. In absolute terms, it most frequently occurs in Thailand, India, and Saudi Arabia. Also, Umasa is the forename as well as the last name.