States: Ohio: Preble
No help as far as Thralls, but in "History of Preble County, Ohio", p. 299, there is the following info on the Pottengers:
The Pottengers arrived in the township in 1803 and today the family has, in all probability, a larger representation in the locality than that of any other of the pioneers. John, Robert and Dennis Pottenger, brothers, came from Kentucky, to which State they had emigrated from Maryland. The first two located in section ten and Dennis, in section two. John Pottenger's first wife was Jane Gilkey, and his second Catharine Railsback of Culpeper county, Virginia. The descendants of John Pottenger were ten in number, the first three born in Kentucky. Thomas, the eldest, married Eliza, daughter of Daniel Robbins, who was a settler in the neighborhood. William married Jane Ward, who is now living in Camden. John married Nancy Barrett. Dennis, the first born of the family in Ohio, was first married to a Hall and afterwards to a Fort. All four of the above mentioned are deceased. Anna, the oldest daughter, married David Barnett. Nancy (deceased) married Joseph Nellinor. Cynthia married Alfred Bell and is living in the township. James was twice married, his first wife being Martha Low and his second, Isabella Eshelman. Reuben married Susan Findlay and Wilson, who is in Camden, Ellen Reed. John Pottenger, the father, died in 1838 at the age of seventy-four years.
Robert Pottenger married, in Kentucky, Fanny Gee. They reared a large family, viz: Dennis, Samuel, Anna, Eunice, Harvey, Willett and Sanford -- all removed to Indiana in 1825.
Dennis Pottenger married his first wife, Sarah Gray, in Kentucky and after her death married Elizabeth Lowden of Butler county. The children of Dennis Pottenger were WIlliam, Hetty Ann (Thralls), now in Florida, Dennis R., Louis and John. Hetty Ann and John are the only ones living and the latter is in Kansas. Dennis R. married in 1847, Susan, daughter of Bazael Brown of Wilson county, Kentucky. He died in 1879 and his widow resides in Camden.