I have a lot of Bair and Baer Ancestors.A Hans Baer dates back to b. 1578 Zurich, Switzerland. A Hans Baer b. 25 Oct 1691 d. 1754 Lehigh, PA and Anna Baer b. 19 July 1705 Zurich, Switzerland d. 1730 Lancaster, PA had a son Rudolph. He was b. 17 May 1722 Zurich, Switzerland d. 1788 Mt. Pleasant, PA. His name is recorded as Rudolph Bair.I am descended from the Bair line. View my Bertram Family Tree on Ancestry.com.