Beowulf has a Scandinavian background to the story. Shortly after "hwæt", it mentions "gar-Denas" or spear Danes. (Old English had become heavily influenced by Norse by the time of the Norman invasions, especially in ita northern dialects.)
There may be a Celtic influence upon it as well, as with some of the Icelandic sagas, but you would have to dig much deeper for that.
There may be a Celtic influence upon it as well, as with some of the Icelandic sagas, but you would have to dig much deeper for that.