Halfdan Ragnarsson
Halfdan
Halfdan III de Vestfold
Halfdan E
Halfdan le Vaillant
Halfdan le Doux
Halfdan Hvitbeinn
Eowils et Halfdan
Halfdan Egedius
Halfdan Skjöldung
Halfdan le Vieux
Halfdan T. Mahler
Halfdan (floruit 782–807)
Halfdan Kjerulf
Halfdan Gran Olsen