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 | Brazil, Argentina, Mexico, Germany, Paraguay |
| Gustav | Brazil, Argentina, Mexico, Germany, Venezuela |
| Gustave | Brazil, Colombia, Argentina, Germany, Venezuela |
| Gustaf | Brazil, Mexico, United States, Sweden, Germany |
| Gustaaf | Brazil, Spain, United States, Germany, Venezuela |
| Gusztáv | Romania, Slovakia, Austria, Hungary |
| Gustavus | Brazil, United States, Sweden, Germany, Costa Rica |
| Gustáv | Slovakia, Hungary |