Cognomen Ulfar (Ulfar 
) , throughout the world, is an extremely rare last name. The surname Ulfar is habitual in Northern Europe, particularly Iceland, where it is quite a rare surname. More prevalently, Ulfar is the forename as well as the last name.
Fahri, Thordarson, Danielsson, Kristjonsson, Bergthorsson, Steindorsson, Fridjonsson, Haraldsson, Heimisson, Helgason, Norddahl, Jonsson, Doelman, Njalsson, Martin, Erlingsson, and Gudmundsson