That's interesting, AR, I didn't know it used to be called Eothburg, or that Eoth meant Earth. It could point to a goddess connection, or it could simply be that the name means "earthern mound" (a law, as you say, being a hill or a mound). The "burg" bit is interesting - this name, in my experience, is associated with settlements, villages and towns, even cities. I have a vague memory of it meaning "farm" in one of the Gaelic languages. Have a look for Bur in the Modern Antiquarian, though. I'd argue that the "hlaw" isn't a Hoeur name, but instead remembers Llew/Lugh.

http://www.themodernantiquarian.com/post/13009