Last name Gústav (Gústav ) , worldwide, is an extremely rare family name. Much more frequently, Gústav is the forename as well as the last name.
Gustaf, Gustau, Gustav, Gustave, Gustavo, Gustavus, Gustaw, Gustáv, Gösta, Kustaa, Госта, Густав, Густав, Гюстав, Густаво, Густаф, Гюстав, Куста, גוסטב, غوستاف, غوستافو, グスタフ, and グスタボ
Bergman, Sveinsson, Daníelsson, and Gústavsson
) , worldwide, is an extremely rare family name. Much more frequently, Gústav is the forename as well as the last name.