Cognomen Buena-Agua (Buena-Agua 
) , all around the world, is a very rare surname. The family name Buena-Agua is characteristic of Philippines, where it is a very rare surname, and the United States, where it is an extremely rare surname. Parts of the name also exists independently as a last name Buena.
| VARIANT | COUNTRY |
|---|---|
| Buena-Agua | United States, Philippines |