Cognomen Buna-Ay (Buna-Ay 
) , in all the world, is an extremely rare last name. Much more prevalently, Buna-Ay is the forename as well as the last name. Parts of the name also exists independently as a first name Buna, and a last name Ay.
| VARIANT | COUNTRY |
|---|---|
| Buna-Ay | Philippines |