I am researching the family of Melchior and Katharine Zwald who came from Bern, Switzerland and landed in New York in dec. 1857. They lived first in Sullivan Co., NY, in 1860 moved to Allegheny, PA before 1870 and by 1880 to South Pittsburg, TN. I have information to exchange from the US and would particularly appreciate any leads to their Swiss origins.