I have been putting together family groups for Schwimmer & Ringler that lived in Munkacs, formerly part of Austria-Hungary and now Mukacheve, Ukraine. My goal is to try and connect each of those families to a MRCA. My own family origins in Munkacs are Jakab Schwimmer and (Chaje) Szure Rifke who were born about 1800. There was also Moshe Aron Ringler (likely brother to Naftula Hersh Ringler [1835-1895] son on Lazar) married to Toni Salzberger.
I have already connected distant SWIMMER/SCHWIMMER families that came to the USA in the 1890s, using DNA and then paper-trail. I also connected RINGLER families in Israel and Florida using paper-trail and DNA.
So, if you have Schwimmer or Ringler family that you can trace back at least to 1890 and that lived in Munkacs, please reach out. If you are not sure where your Schwimmers are from, try the paper trail first? I have found that WWII draft records are an excellent source for town of birth. Of course, naturalization records would also list place of birth. I would be happy to hear from you and help you, if you. Kindly reply just to "sender".