My name is Glenn J. Coert (born in 1966). I saw your email on the Genealogy site. I know that Karel N. Coert is an important man in 'our Coerts' History. I know that his parents were Joachim F. Coert [????-1824] and Sara Poelman [1788-1838]. And the father of Joachim was Johannes Coert (his wife Maria A. van Haack).