John Gundacker of the Borough of Lancaster reported to the clerk "that his mulatto servant wench, Grace was on July 12, 1814, delivered of a male mulatto child, which she calls and has named Abraham."
I am not related to this family, just passing on this information, which comes from a webpage titled "Slavery in Pennsylvania - Slave Names." The link for the site is listed below.
Joyce
http://www.afrolumens.org/slavery/names.html