I want to discuss some ideas:
1- Could the Dumezilian PIE pair
Terrible-Sovereign and Lawgiver (let´s call them Mitra-Varuna) be
originally Moon and Sun God? Any relation to Sumerian Sin and
Utu?
2- Sanskrit Varuna = Mitani Arunash. Indo-Aryan
*Varunas or *Arunas?
3- Njördr-Freyr-Freyja = Sin-Utu (Shamash) -Inana
(Ishtar) ? I know that it would be an odd link, probably just a coincidence, but
there are some interesting parallels.
Joao SL