Although the origin of the word God is difficult to research as any written work which mentions the Gads is listed among the banned books of the world. There are many written works of recent times which have been banned but there are pre-views of parts of the books which can be found. The word God does go back further than Ishtar as she usurped the title from Lord Indra who was called Khooda which is as far back in time you can go. I am not a Luciferian or admirer of the devil if that is what you are into that is your business and for what it is worth all the best with that.
God is the Arcadian name of the whore of Babylon the Roman Lucifer