Thanks so much for the reply but I have a feeling there is no connection. The family was from Bohemia, Karl Maertz came from Kout which was a town rather near the border with Germany. A couple of members of my family took on the German form of their name after moving to Milwaukee. The early records show the name as Merz or Marz. My Toepfer relatives were originally Hrncir (both names mean the same thing, Potter.)
I am seeking information on Johann and Wilhelmina (Rusch) MAERTZ. They arrived in Milwaukee in 1852 and lived there for 1-2 years before buying land in Reedsville, Manitowoc County, Wisconsin. Their son, Friedrich C. Maertz and his wife Eva later raised their family in Milwaukee.