In John Kerr's will, "Black Pete" is called "John."
"Last Will and Testament of John Kerr, Jr., September 8, 1794," Washington County Courthouse 1:239-40 in "Abstracts of Wills of Washington County, Registered and Little Washington, Pennsylvania," Publications of the Genealogical Society of Pennsylvania, 6, no. 2 (March 1916): 154
John Kerr of Straban Township, Washington County, dated June 2, 1794, proved September 8, 1794; wife Rachel; children, Polly and John, minors; brother William; negro boy John; executors, brother James Kerr and Craig Ritchie both of Washington County; witnesses, Craig Ritchie, James Kerr and Wm. Scott.