You have given many things as names which are not. Adonai simply means Lord -- this is not a name. Elohim simply means God (or gods, or judges, or heavenly beings) and is not a name. El Elyon simply means God Most High and is not a name etc.
Exodus 6:3 states, " and I appeared unto Abraham, unto Isaac, and unto Jacob, as God Almighty, but by My name [yad hey and vav hey] I made Me not known to them.
In other words, Abraham gave God a title, but after Egypt, the Israelites knew the actual name of God.
The pronunciation of this name is now lost in history. As Jews we do not attempt to use approximations when we read the text. Rather we substitute the word Adonai. And even now I am using Adonai for instructive purposes -- normally when we are not worshiping, we substitute Hashem or Adoshem (the Name). I have been taught that the spelling out of the letter names in print is acceptable if instructing. This is out of the GREATEST respect for the name of God, and the unwillingness to even come close to taking his name in vain.