Cognomen Gudjon (Gudjon 
) , across the world, is an extremely rare last name. The cognomen Gudjon is habitual in Spain, where it is an extremely rare surname, and the United Kingdom. Much more prevalently, Gudjon is the forename as well as the last name.
Gam, Ellertsson, Erlendsson, Haflidason, Olafsson, Oskarsson, Magnusson, Stefansson, Styrkarsson, Arngrimsson, Baldvinsson, Gudlaugsson, Guðmundsson, Halldorsson, Hermannsson, Sigurdsson, Kristinsson, Kristjansson, Gunnarsson, Gustafsson, Bernhardsson, Kristbergsson, Tomasson, Thorisson, Larusson, Gislason, Sson, Mundsson, Geirsson, Sæmundsson, Blondahl, Karason, Knutsen, Jonsson, Hauksson, Valberg, Gudmundsson, Oddsson, Sverrisson, Asmundsson, Agustsson, Bergmann, Bjornsson, Bjarnason, Karlsson, Reynisson, Desender, Gudjonsson, Saevarsson, and Engilbertsson