Surname Cha-Ong (Cha-Ong 
) , in the entire world, is an extremely rare last name. The surname Cha-Ong is habitual in South-eastern Asia, particularly Philippines, where it is an extremely rare surname. Parts of the name also exists independently as a last name Cha, and a last name Ong.
| VARIANT | COUNTRY |
|---|---|
| Cha-Ong | Philippines |