Please answer a question about the following article about John von Neumann:

In 1913, his father was elevated to the nobility for his service to the Austro-Hungarian Empire by Emperor Franz Joseph. The Neumann family thus acquired the hereditary appellation Margittai, meaning of Marghita. The family had no connection with the town; the appellation was chosen in reference to Margaret, as was those chosen coat of arms depicting three marguerites. Neumann Janos became Margittai Neumann Janos (John Neumann of Marghita), which he later changed to the German Johann von Neumann.

What was Von Neumann's given name as member of Austro-Hungarian nobility?
Margittai Neumann Janos