I like all of these designs, but I'd also like to see what #2 would look like with the letters D and S. I don't know if that would work, but I'm open to your ideas.
Some other ideas that have crossed my mind: - using a Deringer as the final "r" in the word Deringer - using a Deringer as part of the letter "s". I don't know how feasible this is, but there's kind of a curve to it, so it might be possible. I'm far from being an artist...I just come up with ideas.