Gunpowder was listed in a "Summary Of The State Of Lord Baltimore's Mannours, 1766-'68," as follows:
Harriot's Hope was assigned to Sutton Gudgeon according to this genealogical entry (and here); also listed are Richard, Ann and Mary Harriot.
A document stating:
Mr. Oliver Harriott, Near Gunpowder River
March 22, 1732, I assign all my right of the within mentioned land unto Richard Harriott...
Oliver Harriot was the third (and final) husband of Ann Taylor, who married 1st James Greer. I'm descended from Ann and James Greer.