Surname Steinthor (Steinthor 
) , in the world, is an extremely rare cognomen. Much more frequently, Steinthor is the forename as well as the last name.
Ardal, Thordarson, Gunnarsson, Steinthorsson, Sigurdsson, Hilmarsson, Josephson, Jakobsson, Magnusson, Oskarsson, Olafsson, Einarsson, Gudmunds, Runolfsson, Bjarnason, Asgeirsson, Asmundsson, Hrafnsson, Jonsson, Arnason, Gudmundsson, and Thorsteinsson