Family name Eyþór (Eyþór 
) , across the world, is an extremely rare surname. Much more prevalently, Eyþór is the forename as well as the last name.
Logi, Eiríksson, Frímannsson, Óskarsson, Ólafsson, Úlfarsson, Þorsteinsson, Sigurðsson, Sigmundsson, Stefánsson, Alexander, Konráðsson, Guðmundsson, Jóhannesson, Tryggvason, Eysteinsson, Hilmarsson, Valgeirsson, Ásgeirsson, Björgvinsson, Kristinsson, Gunnarsson, Einarsson, Jóhannsson, Gíslason, Guðjónsson, Gylfason, Jóvinsson, Þrastarson, Melsteð, Möller, Snorrason, Jónsson, Eyþórsson, Eyjólfsson, Eðvaldsson, Theodórsson, Harðarson, Helgason, Árnason, Magnússon, Baldursson, Borgþórsson, Birgisson, Björnsson, Phillips, Rögnvaldsson, Guðnason, Hauksson, and Þórarinsson