Tom Shippey, in The Road to Middle-earth (pp. 193–194) says that the hunting of the great wolf recalls the chase of the boar Twrch Trwyth in the Welsh Mabinogion, while the motif of 'the hand in the wolf's mouth' is one of the most famous parts of the Prose Edda, told of Fenris Wolf and the god Týr; while Huan recalls several faithful hounds of legend, Garm, Gelert, Cafall.
Bruce Lincoln further traces Geri back to a Proto-Indo-European stem *gher-, which is the same as that found in Garmr, a name referring to the hound closely associated with the events of Ragnarök.