Oscar Zoroaster Phadrig Isaac Norman Henkle Emmannuel Ambroise Diggs

The Wizard's full name, given him by his politician father in Omaha, so long that he uses only its first two initials.

First named in Dorothy and the Wizard in Oz, ch. 15

In the first place, I must tell you that I was born in Omaha, and my father, who was a politician, named me Oscar Zoroaster Phadrig Isaac Norman Henkle Emmannuel Ambroise Diggs, Diggs being the last name because he could think of no more to go before it.