Gustav is a widely used name; it has 25 variants that are used in English and other languages. Variants used in English include Gussy, Gustaf (used in German and Scandinavian too), Gustave (used in French too), Gustavo (used in Italian, Portuguese, and Spanish too), Gustavus, and Gustus. The contraction Gus (used in Irish, Scandinavian, and Scottish too), and the diminutive form Gussie are other English variants.
Foreign variants of Gustav include Gustaaf (Dutch), Gustaff (Dutch), Gustavs (Latvian), Gustaw (Polish), Gusti (Czech), Gustik (Czech), Gusty (Czech), Gusztáv (Hungarian), Guus (Dutch), Kosti (Finnish), Kustaa (Finnish), Kyösti (Finnish), Staaf (Dutch), Tabo (Spanish), and Tavo (Spanish). Specific foreign variants include the contraction Gösta (Scandinavian), and the diminutive form Gustl (German).
Gustav is uncommon as a baby boy name. At the modest height of its usage in 1905, 0.015% of baby boys were named Gustav. It was #482 in rank then. The baby name has seen a marked decline in popularity since then, and is of only very light use now. Within the family of boy names directly related to Gustav, Gustavo was the most widely used in 2018.
Baby names that sound like Gustav include Gustaaf, Gustaf, Gustaff, Gustave, Gustaw, Gusztáv, and Gustavo.
† Pronunciation for Gustav: G as in "grin (G.R.IH.N)" ; UW as in "two (T.UW)" ; S as in "see (S.IY)" ; T as in "tee (T.IY)" ; AA as in "odd (AA.D)" ; F as in "fee (F.IY)"