David Wherry, who was born near Oxford, Chester County, Pennsylvania, in 1757, married Ann Hall and moved westward to Washington County, Pennsylvania, in 1799. Two years later they moved to Belmont County, Ohio, where they raised a large family. In 1810 a new county was created out of part of Belmont, and named Guernsey. David and Ann lived out there lives there, but most of their family continued the westward migration to Iowa where some of them lived in a town called Guernsey. According to family lore, the town of Guernsey, Iowa, was named by Joseph Wherry (son of David) in honor of his home county in Ohio. Joseph and his family moved there in 1869.
I don't know whether there are any Wherrys still living there or not.