Namesakes
Notable Philosophers and Thinkers:
1 mathematician
John von Neumann (a.k.a. Neumann) 1903-1957 
Olympic Medalists:
1 bronze, 1 gold, 1 silver
(gold) Paul Neumann 1896 swimming - 400 m freestyle
(silver) Otto Neumann 1928 4x400 m relay
(bronze) Meta Elste (a.k.a. Neumann) 1948 artistic gymnastics
Saints:
1 saint
Saint John Neumann 1811-1860