Per the information that I tracked down for my boss (his paternal great-grandmother was a Willey), I have Waitman Willey, born June 14, 1792 and died July 17, 1873. Waitman Willey and his wife, Nancy (maiden name unknown) are buried at the Isaacs Family Cemetery northwest of Georgetown, Sussex County, Delaware. It is on private property and access is difficult.
Waitman's father was Robert Willey who died January 1797 in Sussex County, Delaware. His probate records can be found at the Delaware Public Archives in Dover, Kent County, Delaware. The records provide for his minor son, Waitman. Robert's wife at the time of his death was named Prudence. Her maiden name is unknown and I am presuming that she would be Waitman's biological mother, although I have no concrete proof.
I have not positively identified Robert's parentage. He could possibly be the son of one of the many John Willey's that abounded in the Nanticoke Hundred of Sussex County, Delaware at that time. Or perhaps out of Dorchester, Worcester or Somerset Counties in Maryland. It's something that would require more time and access than I currently have.
You may want to check the Colonial Roots bookstore in Lewes, Sussex County, Delaware for what they have on the various Willey lines. Their website is: www.colonialroots.com