Family name Bul-Ao (Bul-Ao 
) , in the world, is an extremely rare cognomen. The last name Bul-Ao is characteristic of South-eastern Asia, particularly Philippines, where it is an extremely rare surname. Parts of the name also exists independently as a first name Bul, and a last name Ao.
| VARIANT | COUNTRY |
|---|---|
| Bul-Ao | Philippines |