We had emailed already about our Hopfinger connection. I still have your Katherine on my "orphan" Hopfinger list.
The Hopfingers were from Selz, Kutschurgan and MightHelp was right, the best free source to start is the Odessa3 website.
Then The Germans from Russia Historical Society has the most information on the Odessa, Russia area. Your family names are in several of the resources. And the Listserves (email groups) have been very helpful.
The Odessa Catholic Archives have not made their information public and it is expensive to obtain the materials and then have them translated from Russian/Old German to English.
Hopfingers were orginally from the Haganau, Alsace and those records are online, http://archives.bas-rhin.fr/scripts/accueilanglais.asp
. However, you have to manually search through each page as they are not indexed. I have not started to look as I need a whole day to get into the French/Latin/Old German script.
Will keep you updated.