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Across the world, Gústaf (Gústaf ) is an extremely rare male first name.
Gustaf, Gustav, and Kustaa
Adólf, Sæland, Bjarkason, Jónsson, Hjálmarsson, Bjarnason, Darrason, Einarsson, Hinriksson, Ólafsson, Sigurðsson, Gústafsson, Hermannsson, and Kristjánsson