Family name Ongau (Ongau 
) , worldwide, is a rare surname. The family name Ongau is habitual in Kenya, where it is a rare surname, Malaysia, where it is an extremely rare surname, and the United States. Very seldom, Ongau is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ongau | India, Kenya, Malaysia, United States |