DNA Could Solve the Derringer - Derendinger Dilema

If a Derendinger would be willing to do the DNA test, we might be able to confirm or discount the connection between the Derringer and Derendinger line. I have attempted to find a Derendinger willing to swab the inside of their mouth and send in the DNA, but I do not have any takers as yet. If you know of anyone willing to do the test, let me know.