Hi Cynthia, I hope this information can help you and not open a deadend.
While researching Colleton Co. SC. I ran across
this info. From the 1800 and 1820 census.

1800

William C. Pinckney 6 in household 43 enslaved.

1820

M.B. Pinckney 20 enslaved
Wm. Pinckney 53 enslaved
C.C. Pinckney 75 enslaved
Roger Pinckney 46 enslaved

There maybe more Pinckneys in this area, but
these were all in the copies I got. Maybe some of these families travel to your county.

Happy Hunting

gog