Why Are there ‘Lutherans’ and ‘Calvinists’ and ‘Wesleyans’ But Not ‘Zwinglians’?

Because Zwingli taught his followers to exalt God alone.  A lesson the Lutherans and Calvinists and Wesleyans must have missed.

This is the fountainhead of my religion, to recognize God as the uncreated Creator of all things, who solely and alone has all things in His power and freely giveth us all things. They, therefore, overthrow this first foundation of faith, who attribute to the creature what is the Creator’s alone. For we confess in the creed that it is the Creator in whom we believe. It cannot, therefore, be the creature in whom we should put our trust. – Zwingli

Nor, it should be added, after whom we name ourselves.