Johann and Anna Maria had upwards of 11 living children.6 boys and 5 girls. Your ancestor had to have been Johann George, their 9th child (married Anna Maria Haas?).My ancestor, Anna Catharine, was their 7th.They were married in 1709 in England, prior to sailing for America.Their first child was born in 1711 in Livingston, New York and their last was born in 1742 in PA. Let me know if you'd like more information.
I can also tell you that your father is not the last in the Zeller line.:)Rest assured, the Zeller name will live on.