Quick answer
Gustáv is a boy name meaning "staff of the Geats".
Pronunciation: Swedish /ˈɡɵs.stav/; German /ˈɡʊs.taf/; Czech /ˈɡus.taːf/.
Meaning and history
Possibly means "staff of the Geats", derived from the Old Norse elements gautr meaning "Geat" and stafr meaning "staff". However, the root name Gautstafr is not well attested in the Old Norse period. Alternatively, it might be derived from the Old Slavic name Gostislav. This name has been borne by six kings of Sweden, including the 16th-century Gustav I Vasa. Another notable bearer was the Austrian painter Gustav Klimt (1862-1918).
Notes and context
Usage: swedish, danish, norwegian, german, czech