Family name Ongsang (Ongsang 
) , all around the world, is a very rare cognomen. The surname Ongsang is habitual in Thailand, where it is a very rare surname, and China, where it is an extremely rare surname. Likewise, Ongsang is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ongsang | China, India, Thailand |