there seems to have been originally but one Norn: called Urth in Old Norse, in Old High German Wurd, and in Anglo-Saxon Wyrd. The word may be related to the German werden, 'to become, to grow,' which would suggest a sense of inward inherent destiny, comparable, essentially, to Schopenhauer's concept of 'intelligible' character.
Campbell establishes the core philological and philosophical argument: Wyrd names an immanent, becoming-destiny rooted in the self, distinct from externally imposed fate, and genealogically linked to the spinning Norns and the Greek Moirai.
, Creative Mythology: The Masks of God, Volume IV, 1968thesis