There was a Kretz family in the 1800's on Lake Constance, the lake that is bordered by Germany, Austia, and Switzerland. On this "bodensee" there was a Kretz family with 13 children, They first lived in Germany and then Switzerland. This is where my grandfather's family was from. Apparently he and his brother immigrated to North America. One went to Canada, and one to the U.S. I have fourth cousins in California. Eric Kretz, the drummer for the band the Stone Temple Pilots is related to my family.