My great great grandfather 's name is Dr.john Dayan. he is from loweville New York. his father came from Austria in 1780 and died in 1793 in amsterdam NY.I understand his family is related to the Leopold Von Daun Field marshals for Theresa?. He changed his name to Dayan when they came to the states. the Dr. john Dayan had some very important sons. One was a Rev. One was in New York congress and Lawyer in watertown NY. before he died. i can trace down to my family. I lived with his great greatson in Toledo Ohio. any help on the Austrian side would be great.