Family name Gustaf (Gustaf 
, Густав 
, גוסטב 
, among others...) , globally, is quite a rare last name. The surname Gustaf is habitual in Namibia, where it is quite a rare surname, Sweden, and Indonesia, where it is a rare surname. Not in comparison with a country's population, it is commonest in Indonesia, Sweden, and the United States. More prevalently, Gustaf is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gustaf | Sweden, Indonesia, Finland, United States, Tanzania |
| Густав | Kazakhstan, Russia, Estonia, Ukraine, Lithuania |
| גוסטב | Israel |
| Густаф | Kazakhstan, Russia, Ukraine |
| gustaf, friherre von der pahlen 6 May 1648 - 18 Aug 1736 (b. 1648) |
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| carl gustaf, baron kruuse 1655 - 1710 Göteborg (b. 1655) |
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| johan gustaf, baron von rosen 1677 - 8 Apr 1752 (b. 1677) |
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| peter gustaf, friherre stackelberg 29 May 1762 Sutlem - 30 Jun 1826 Riesenberg (b. 1762) |
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| johan gustaf (1831-1897) (b. 1831) |
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carl xvi gustaf current king of Sweden (1973–), SE (b. 1946) |
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| per gustaf victor SE (b. 1968) |
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| carl gustaf, baron armfeldt, 1.baron of isnäinen 9 Nov 1666 in Ingria - 24 Oct 1736 Isnäinen manor, Pernaja, Finland |
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Ck, Anderson, Carlsson, Karlsson, Lindberg, Lindgren, Lundberg, Lundgren, Ljunggren, Ericsson, Sjöberg, Eriksson, Forsberg, Sandström, Andersson, Bengtsson, Lundström, Johansson, Samuelsson, Bergström, Pettersson, Hamilton, Svensson, Fjelstrom, Hansson, Berg, Blom, Dahl, Gans, Holm, Bratt, Ekman, Olson, Nordin, Nelson, Olsson, Möller, Carlson, Persson, Larsson, Lindqvist, Jansson, Johnson, Jonsson, Nilsson, Ericson, Gustafsson, and Lindström