Surname Þorsteinn (Dustin 
, Torsten , Þorsteinn 
) , globally, is quite a common cognomen. The last name Þorsteinn is characteristic of Iceland, where it is quite a rare surname, Finland, and New Zealand. In absolute terms, it is commonest in the United States, Germany, and Indonesia. Predominantly, Þorsteinn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dustin, Torsten | United States, Indonesia, Sweden, Germany, Canada |
| Þorsteinn | United Kingdom, Denmark, Iceland, United States, Norway |
| Torsti | Thailand, United States, Spain, Finland, Canada |
Ólason, Ólafsson, Þorsteinsson, Sigurðsson, Stefánsson, Pétursson, Garðarsson, Guðmundsson, Jóhannesson, Eggertsson, Halldórsson, Halldorsson, Hreggviðsson, Finnbogason, Ásgeirsson, Aðalbjörnsson, Kristinsson, Ragnarsson, Gunnarsson, Haraldsson, Hallgrímsson, Benediktsson, Einarsson, Erlingsson, Jóhannsson, Gíslason, Snædal, Rafnsson, Gestsson, Geirsson, Sæmundsson, Snorrason, Barðason, Pálsson, Jónsson, Egilson, Kristjánsson, Eyþórsson, Helgason, Hjaltason, Árnason, Þórsson, Magnússon, Sverrisson, Sveinsson, Bragason, Björnsson, Bjarnason, Hauksson, and Valdimarsson