I should think that Elohim is really a quasi proper name when applied to the Hebrew God, just because it is unusually in the grammatical plural when denoting a grammatical singular. I agree "el" isn't a proper name but it may be when suffixed with a scriptural designator: El elyon, El shaddai etc: these are all subsumed into the biblical o theos. Similarly Logos has become a de facto proper name for the Word in English. It's easy for words to become proper names in a well defined context.
I think if we do not grasp that the biblical context is well defined and exclusive, we are missing something vital. We can't allow the traditions of paganism to impinge on scripture. Although Paul says there are many gods, for us, there is but one:
1 Cor 8:5,6 "For even if there are so-called gods, whether in heaven or on earth (as there are many so-called gods and lords) yet for us there is but one God, the Father, from whom all things came and for whom we exist. And there is but one Lord, Jesus Christ, through whom all things came and through whom we exist.…"