All gods in Rig Veda are being qualified with word "Sovran" which in English could mean sovereign but it could also mean "sauvaran" or "sovaRaN", meaning "gold covered" or "made of Gold".
Interestingly meaning of "sovereign" is also a gold coin, besides supreme ruler or Lord.
Indra is also called "Sovran".
Sun worship was prelevant in Middle East and it remains has the bearing in the country Syria which Arabs call "Suriya".
Whose attributes are Gold would be Rich and Powerful - and a Supreme Ruler.