A good book on this is Proto by Laura Spinney, it covers all the branches of Proto-Indo-European and also postulates that the entire family may have started from as few as a hundred speakers who were steppe nomads, which is mindboggling if true.
Asura - Aesir - Olympians
Devas - Vanir - Titans
And the etymology of "Hormuz", allegedly, "Ahura Mazda"https://press.princeton.edu/books/paperback/9780691148182/th...