Namesakes
American Presidents:
1 president
Harry S. Truman (a.k.a. S) 1945-1953 
Fictional Characters from Television:
2 characters
Harry Solomon (a.k.a. S) 1996 3rd Rock from the Sun
George S. Hammond (a.k.a. S) 1997 Stargate SG-1
Notable Writers:
1 author
C. S. Friedman (a.k.a. S) 1957-