Yes, I believe that Henry M. was third son of Henry M (1st) who was eldest son of Pieter Kieviet(b-7/1726). I will foward your data to Bill Kivett who has extensive Kivett records. Pieter Kieviet signed his will as Pieter Kieviet. It was after his death that his children began signing as Kivett. Kieviet is definately a name of Dutch origin.