Gyda is from the Old Norse guð (god) or guðr (battle). **Gyda Eiriksdottir (9th c.)** was the Norwegian noblewoman who **refused to marry King Harald until he had united all of Norway under his rule** — Harald swore not to cut or comb his hair until he had done so. **Her demand effectively created the Kingdom of Norway.**
Featured in Snorri Sturluson's Heimskringla.
Gyda reduces to four — the number of Norwegian queen.