Family name Hafsteinsson (Hafsteinsson 
) , worldwide, is a rare cognomen. The cognomen Hafsteinsson is habitual in Iceland, where it is a common surname, Malta, where it is quite a rare surname, and Denmark, where it is a rare surname. Not in comparison with a country's population, it is commonest in Northern Europe, particularly Iceland, Denmark, and Norway. Very seldom, Hafsteinsson is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Hafsteinsson | Denmark, Norway, Malta, Iceland, Switzerland |
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vésteinn hafsteinsson athletics competitor, IS (b. 1960) |
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magnús þór hafsteinsson Icelandic politician, IS (b. 1964) |
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| eyleifur hafsteinsson association football player, IS (b. 1947) |
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| hafsteinn gunnar hafsteinsson actor (b. 1972) |
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| sigurjón baldur hafsteinsson researcher |
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| hjalmtyr hafsteinsson Ph.D. Cornell University 1988 |
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| viðar örn hafsteinsson icelandic basketball player and coach, IS (b. 1985) |
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| guðmundur steinn hafsteinsson Icelandic association football player, IS (b. 1989) |
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| atli vidar hafsteinsson |
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| fannar hafsteinsson association football player, IS (b. 1995) |
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| daníel hafsteinsson Icelandic association football player, IS (b. 1999) |
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Mr, Magnus, Magnús, Stefã, Snorri, Bardur, Birkir, Birgir, Ragnar, Gunnar, Gísli, Leifur, Jonbjörn, Jóhann, Eythor, Haukur, Heimir, Hilmar, Hörður, Viktor, Vignir, Viðar, Árni, Oddur, Hlynur, Hoddi, Jon, Jã, Arll, Atli, Guã, Jens, Jón, Emil, Viã, Orri, Fannar, Örn, Andri, Arnar, Runar, David, Davã, Gylfi, Larus, Jakob, Hafþór, Helgi, Máni, and Olafur