Cognomen غوستاف (Gustavo 
, Gustav 
, Gustave 
, and others...) , in all the world, is a widespread surname. The last name غوستاف is habitual in Latin America and the Caribbean, particularly Saint Lucia, where it is a common surname, Mexico, and Honduras (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in Latin America and the Caribbean, particularly Mexico, Argentina, and Venezuela. More prevalently, غوستاف is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gustavo | Germany, Paraguay, Mexico, Argentina, Brazil |
| Gustav | Germany, Mexico, Argentina, Brazil, Venezuela |
| Gustave | Germany, Colombia, Argentina, Brazil, Venezuela |
| Gustaf | Germany, Sweden, Mexico, United States, Brazil |
| Gustaaf | Germany, Spain, United States, Brazil, Venezuela |
| Gusztáv | Austria, Hungary, Romania, Slovakia |
| Gustavus | Germany, Sweden, Costa Rica, United States, Brazil |
| Gustáv | Hungary, Slovakia |