Cognomen Isaac Gustavo (Isaac Gustavo 
) , around the globe, is an extremely rare family name. The last name Isaac Gustavo is habitual in Latin America and the Caribbean, particularly Chile, where it is a very rare surname. More frequently, Isaac Gustavo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Isaac Gustavo | Spain, Peru, Chile, Ecuador, Costa Rica |