Did the early Bible writers think in their minds that there was a single name for god ? the earliest certainly did in my view, being believers in the existence of many gods they would identify theirs by name. El probably.
But it would seem that as they evolved in there Theology toward being Monotheists, they began to think that god did not have a single name, but many names that described his qualities. It would seem to me that the Exodus scripture is trying to get this point across, that god will be what he wants to be, and can be whatever he wants to be, mostly. I say mostly because a couple of scriptures show clearly where the god of Israel was unable to achieve something, so not Almighty then !
The fuss about there being a single name of god seems to be on dodgy ground, and to insist that YHWH is that name is even more dodgy. If you only believe in one god, as a being above all others, why would he need a name ?
To insist that it is some how virtuous to use a single, discrete, name in any form or pronunciation as JW's do is like most if not all of their teachings, not really supported by a proper reading of the Bible.