While your correct, historically, J had the same sound as I, it wasn’t until much later that it acquired the current sound that we’re familiar. For any of the Hebrew words with a J, it’s sufficient to replace it with a Y or an I if you’re requiring accuracy. So, Yacob, Yerushalayem, and Eliyah.
It’s a throwback to Mesopotamian mythology. El and Asherah had 70 Eloheim, each of the Eloheim is called an Eloah. The Eloheim each rule over a nation, and presumably Yahweh is the Eloah of Israel.
It’s not certain how Yahweh replaced El as the head of the pantheon.
We don’t know what Yahweh means, but it’s not Creator. The word meaning to create is Bara. which isn’t anywhere close to Yahweh.
Yahweh Eloheim just means Yahweh of the Sons of El.
Yes there is. Ehiah Asher Ehiah is from Exodus 3:14 where Moses asks for the name of the Eloah of his ancestors, and the Eloheim said to Moses, I AM THAT I AM.
Asherah was El’s consort. It’s not known when Yahweh replaced El as the head of the pantheon. There is no connection between Asherah and the Holy Spirit. Firstly, the Holy Spirit, being a non-corporeal being has no gender and can be neither a woman nor a man.