HATFIELD: The Hatfields of Westchester: a genealogy of the descendants of Thomas Hatfield, of New Amsterdam & Mamaroneck 1935By Abraham Hatfield The Hatfields of Westchester County, New York: from the time it was under Dutch government, the English and Continental (later called USA). A genealogy of the descendants of Thomas Hatfield, an Englishman who followed the Puritan exodus into Leyden, Holland and his wife, widow Ann (Hamden) Cox and their emigration to America. They were married in 1621. They settled in New Amsterdam and Mamaroneck. Shown are nine generations of