I now believe that Job Bacorn/Bakehorn, Sr. is the same person as Job Becoren who married Jannetie Crancheyt/Krankheyt in 1730.This marriage record and the baptism records listed below are from the First Record Book of the "Old Dutch Church of Sleepy Hollow" organized in 1697 and now The First Reformed Church of Tarrytown, New York, published in 1901 by The Yonkers Historical and Library Association,Translated by Rev. David Cole, Yonkers, NY.
August 21, 1731 (p. 60) register # 724.Jeremias, child of Job Becorent, Janitie his wife; Witnesses or Sponsors:Harck Crancheyt, Helena his wife
October 27, 1733 (p. 63) register # 788.Harkulis, child of Job Bycaren, Janitie his wife; Witnesses or Sponsors:Harkulis Crancheyt, Lea Crancheyt
November 20, 1736 (p. 68) register # 878.Job, child of Job Becoren, Jannitie his wife; Witnesses or Sponsors:Daniel Wilze, Maritie Crancheyt
June 6, 1741 (p. 75)) register # 1021.Jacob, child of Job Becaren, Jannetie his wife; Witnesses or Sponsors:Jacob Wilze, Abiegel his wife
April 30, 1743 (p. 77) register # 1076.Thunnas, child of Job Becaren, Jannitie his wife; Witnesses or Sponsors:Harrick Crancheyt, Maragrietie his wife
August 30, 1745 (p. 82) register # 1173.Jan, "een kint gedoopt" (a child baptized) Job Becaerd; Witnesses or Sponsors:Gerret Cranchheyt, Elizabet his wife
Augus 24, 1748 (p. 87) register # 1283.Gerret, "zyn kind gedoopt" (his child baptized) Job Becaerd; Witnesses or Sponsors:Gerret Cranchkeyt and his wife
I suspect that "Jan" changed his name to John and is the John Bakhorn who received land grants in West Virginia with his brother Job (Jr.).
I suspect that "Thunnas" changed his name to Dennis and is the Dennis Bacorn who drowned at Little Falls, Essex County, NJ in 1791.
I still do not know if "Joseph Becor" is a member of this family.
More data verifying or correcting my interpretations are welcome.