Yes I agree entirely and our understanding can only go so far back. It would be possible to make a case that "bre" meant hill because hills are breast shaped and Bride was a goddess with breasts. When people seek for the origins of words, it is only true to say that there are no known absolute origins. Every word evolved from an earlier word and that change continues at an ever faster rate today. We can only understand what earlier people meant by looking at how words were used to convey objects and ideas at any given period.