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Worldwide, Thordur (Thordur ) is a very rare boy's first name. The forename Thordur is habitual in Northern Europe, particularly Iceland, where it is quite a common male name.
Egholm, Olafsson, Oskarsson, Magnusson, Sigfusson, Lorenzini, Hermannsson, Hilmarsson, Fridgeirsson, Saemundsson, Sigurdsson, Kristinsson, Ragnarsson, Gunnarsson, Johannsson, Thorarinsson, Thordarson, Thorvaldsson, Thorkelsson, Haraldsson, Gudmundsson, Valdimarsson, Vidarsson, Thorsteinsson, Einarsson, Gislason, Arnason, Arnarson, Bergsson, Bogason, Palsson, Raguels, Jonsson, Thorsson, Torfason, Eiriksson, Helgason, Ingason, Sturluson, Sverrisson, Agustsson, Bjornsson, Bjarnason, Karlsson, Reynisson, Runolfsson, Gissurarson, Jonasson, and Adalsteinsson