Cognomen บางอ้อ (Bangaw 
, บางอ้อ, Bang-O ) , in the world, is a very rare surname. The cognomen บางอ้อ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname, Philippines, and Malaysia, where it is an extremely rare surname. In absolute terms, it is the most numerous in Philippines, Thailand, and the United States. Very seldom, บางอ้อ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Bangaw | United States, Thailand, Philippines, India |
| Bang-O | Philippines |
| Bangngeon | Malaysia, Thailand |