Last name Oong (Oong 
) , across the world, is quite a rare family name. The family name Oong is habitual in South-eastern Asia, particularly Malaysia, where it is quite a rare surname, Singapore, where it is a rare surname, and Indonesia. Not in comparison with a country's population, it is the most numerous in Indonesia, Malaysia, and China. Likewise, Oong is the forename as well as the last name.