Donna, do you know the name of Jacob's wife? Would it happen to be Yannakey? I found more information.
Benjamin Walker was married to Sophia Van Horn (1757-1844), d/o Garrett & Mary Van Horn. Some VAN HORN information I found today mentions Sophia had a sister, Yannakey, whose son was named James SWARTZ. One of the Van Horn sons was named Barnet, too, which makes me wonder if Barnet and James Swartz are brothers.
The information I found says Yannakey Van Horn Swartz died before 1801. The VAN HORN family lived in Springfield Twp. which has a border in common with Richland.