If you haven't figured this out already, he was almost certainly a son of Ezekiel Hendrick [Nathaniel, Benjamin, Hance] and Jane Hurt of Pittsylvania County, who lived about a mile south of the Roanoke River on the other side of which was the McReynolds farm in Campbell County.

The surety on the marriage bond for Moses Hendrick's marriage to Sarah McReynolds in 1820 was Joel Lain, who had married Ezekiel Hendrick's daughter Sarah Hendrick. Thus Moses Hendrick's brother-in-law.

I am very curious about the source of the information that his middle name was "Herbert". It seems more likely that his name would be Moses Hurt Hendrick, after his grandfather Moses Hurt. Can you tell me how you know that his middle name was "Herbert"?