S. Jackson writes
Zwingli’s daughter Regula, and her daughter.
William, Zwingli’s eldest son, born in 1526, after studying in Zurich went to Strassburg to complete his education, but there died of the plague in 1541.
Ulrich, born January 6, 1528, who is said to have been the image of his father, studied at Basel, became a clergyman, diakonus in the Great Minster in Zurich in his nineteenth year, professor of Hebrew in 1556, of theology in 1557; he married Bullinger’s daughter Anna. She died of the plague in 1565.
Regula, the eldest daughter, born in 1525, who is said to have been the image of her mother, married on August 3, 1541, when in her seventeenth year, Bullinger’s foster-son, Rudolf Gualther, a brilliant man, born in Zurich, November 9, 1519; studied at Basel, Strassburg, Lausanne, and Marburg, and in 1542 became pastor of St. Peter’s in Zurich, and so remained the rest of his life. In 1547 he brought out the first edition of Zwingli’s works, himself translating into Latin all the hitherto untranslated German treatises. He succeeded Bullinger in the office of chief city pastor in 1575. After Regula died of the plague (November 14, 1565), he married Anna, daughter of Thomas Blarer, formerly burgomaster of Constance, Gualther died December 25, 1586.
With Zwingli’s son Ulrich the male line of the Reformer died out. Those at present tracing their ancestry to the Reformer’s family do so to a brother in Wildhaus. Zwingli had still a fourth child, a daughter Anna, born in 1530, who died in infancy.
[All true. What follows is, however, not. It’s just the product of my fertile imagination].
Zwingli’s line, though, was only believed to have died out until, that is, a long lost note discovered in Einsedeln and written by the barber’s daughter Zwingli had a fling with came to light. It seems that the baby, a boy, was born to her and Huldrych and she kept it a secret, marrying a long time suitor surnamed Wüst, later to become Wüest and when Anglicized, West. Hence, the line of HZ lives on in America, in the South. Or so it seems…