That's very odd. My great-grandfather was a Fletcher Swank, but obviously not the same one, since he was born in Indiana in 1845. One of his sons was a Charles Fletcher Swank, but he died in infancy. As far as I know, Fletcher had only one Swank nephew, whose name was John Harlan Swank, so I can't find any direct link to my family. But you have to admit that Fletcher is not a common first name, so I can't help wondering if there is a connection.
For what it's worth, my Fletcher Swank was the grandson of David Swank and Elizabeth Westfall, with David being the 3rd son of John Swank, the early Harlan Co., KY, pioneer.