I am also researching the family line between the Kelley/Kelly. on eof my great grandfathers' was Benjamin Franklin Kell, who had a brother George Washington Kelly. I was always told that one line of the family dropped the second "E" as to not look so Irish, ha ha.
Their father was John Jackson Kelly married to Tabitha Gaines. They lived in VA as far as I know.
Hope this helps, and if you happen to know any further back info on geneology, I would greatly appreciate it!