I was looking in my old king james bible that has been in the family for years , and it says that the most high one is Jehovah so you are right it is in PSALM 83;18 my church never told me that , i would have thought that knowing Gods name would be an important thing , now i know it...
I was reading Daniel and it says that the( Ancient of days )Gave the son of man aurthority, would you say that the ancient of days is the most high God ? because if it is then who is the son of man ? i think it must be Jesus .So it seems that the most high God is separate from Jesus ...