The following data is extracted from Genealogy and Biography of Ontario County, New York.
Cornelius Westfall, descendant of Juriaen Westvall, was born October 7, 1753, died May 13, 1826. He came from Orange county to Phelps, Ontario county, New York, among the early settlers and took up a very large tract of land. He brought negro slaves with him to clear the land and work the plantation. In the census of 1790 he was reported in Montgomery county, New York, with two sons under sixteen and one female in his family. In that census there were in Orange county and elsewhere, the following heads of family: Abraham, Benjamin, Frederick, Jacobus, Johannes, Peter, Petrus. Simon Westfall.
Source: Genealogy and Biography of Ontario County, New York