I had heard of Jacob Esch, who was on the same ship "Duke of Wirtemberg," Capt Montpelior, Master, and who arrived in Philadelphia, along with my ancestor Michael Esch, on 16 Oct 1751. My information is that Jacob was the progenitor of the Mennonite Esch line in Lancaster PA. Jacob Esch may also have been related to my ancestor, Michael Esch, who established himself in Moore Twp, Northampton County, PA. I have his Will, which you can find on my Tree "Esch Ancestry" at ancestry.com. I know nothing further on Jacob. Best Wishes, Bob Esch.