Cognomen Gaston Arnaldo (Gaston Arnaldo 
) , throughout the world, is an extremely rare family name. The last name Gaston Arnaldo is characteristic of Latin America and the Caribbean, particularly Chile, where it is a very rare surname. More prevalently, Gaston Arnaldo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gaston Arnaldo | Chile, Argentina |