63%RatingSave Gender Masculine Usage Finnish Pronounced Pron. KYUUS-tee [key·IPA] Meaning & HistoryExpand Links Finnish form of Gustav. Related NamesFamily Tree·Details VariantKustaaDiminutiveKustiOther Languages & CulturesGustav(Czech) Gustav(Danish) Gustaaf, Gust, Guus(Dutch) Gustave(French) Gustav(German) Gusztáv(Hungarian) Gustavo(Italian) Gustavs(Latvian) Gustav(Norwegian) Gautstafr(Old Norse) Gustaw(Polish) Gustavo(Portuguese) Gustavo(Spanish) Gustav, Gösta, Göstav, Gustaf(Swedish) Name DaysName Days? Finland: June 6