Rebecca's father is now proven to be James Neyland of Jefferson County, Georgia. In the Jefferson Court House in Louisville, Georgia there is a document entitled "A List of Persons Entitled to Draws in the Present Contemplated Land Lottery of 1825, Jefferson County, Georgia. Among those listed are Charlotte Neyland (Widow) and Rebecca Neyland, orphan of James Neyland.
This is documented in the volume "Jefferson County, Georgia and Some Surrounding Areas, Land Records, Volume One, Mid 1700s-Mid 1800's" by Daniel Nathan Crumpton. Copies can be ordered from the author at 477 Atlanta Highway, Warrenton, Georgia, 30828 for $75.00 (includes shipping).
Thanks to Mr. Crumpton for a magnificent volume.
All researchers who have claimed Rebecca to be the daughter of Henry Neyland need to correct their records.