Cognomen Gaston Alfonso (Gaston Alfonso 
) , all over the world, is a very rare family name. The family name Gaston Alfonso is characteristic of Latin America and the Caribbean, particularly Chile, where it is a rare surname. More frequently, Gaston Alfonso is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gaston Alfonso | Peru, Chile, Mexico, Ecuador, Costa Rica |