Catharina Riddel married Ludwig Eckhardt in Germany before immigrating to Baltimore Maryland in 1854. They had several children, one of which was Caroline Eckhardt who later married Johann Herrmann in Baltimore in 1870. They are my great-great grandparents.
On the passenger list of the ship on which the Eckhardts arrived they list their Place of Origin as "Nedda" but on the 1870 US Census they give their birthplace as "Hesse-Dramstadt". Both places are in Hesse (or Hessen) and are near Frankfurt. I have been unable to trace the family any further back and would be interested in hearing from anyone who might be related to the Riddels, Eckhardts or Herrmanns.