I don't have an answer for you but some comments. According to my mt-research Mary "Polly" New was my 36r Ggrandmother tracing the maternal names of my maternal grandmother.
Mary "Polly" New was b. 1782 in Kent County Delaware she married Nathan Baker b. 1764 in Kent County Delaware.
Mary "Polly" New's father was Jethro New b. 1757 in Kent County Delaware.
Mary's daughter Permelia Jane Baker married Samuel Rickner my maternal GG grandparents Permelia's daughter Permelia Jane Rickner married John Harisson VanSlyke my Ggrandparents.
My grandmother was Martha VanSlyke, married James Henry Tuggle
So at least some of the descendants of Jethro New have surnames; Kelly (me) Tuggle Van Slyke Rickner Baker New & his wife's maiden name was Bowman Her father, William Bowman b. 1745 in Kent Co. Delaware He married Mary Hite b. 1748 in Kent County Delaware.