Etymology tree Proto-Indo-European *h₂ems- Proto-Indo-European *-us Proto-Indo-European *h₂émsus Proto-Germanic *ansuz Proto-Norse *ᚨᛊᚢᛉ (*asuʀ) Old Norse áss Proto-Indo-European *gʰerdʰ- Proto-Indo-European *-os Proto-Indo-European *gʰórdʰos Proto-Germanic *gardaz Old Norse garðr Old Norse Ásgarðrlbor. English Asgard Learned borrowing from Old Norse Ásgarðr. Agartha may be a corruption of this.