I would like to know where they originated in Europe before arriving in America.
The 'booklets" name David De Veau from Amsterdam who settled in Harlem in 1662. Also included are excerpts of a letter from Erastus Dafoe claiming his great-grandparents (John/Johan) were German and from the area of Alsace-Lorraine.
There are 20 family trees at Ancestry.com that have adopted Daniel Dafoe of Vail, Switzerland as the head of the American Branch, arriving in 1710.

It appears that the family structure is fairly well supported back to Abraham. I have Conrad, son of John Ernst Dafoe and John, son of Abraham. Do you concur?

Conrad would be my 4th Great-Grandfather.