Namesakes
Fictional Characters from Television:
1 character
Arnold Shortman 1996 Hey Arnold! 
Nobel Prize Winners:
1 peace
(peace) Al Gore (a.k.a. Arnold) 2007
Notable Actors and Actresses:
3 actors
Arnold Schwarzenegger 1947-
Rodney A. Grant (a.k.a. Arnold) 1959-
Arnold Vosloo 1962-
Notable Athletes:
2 soccer, 1 golf, 1 ice hockey
(ice hockey) Rune Johansson (a.k.a. Arnold) 1920-1998
(golf) Arnold Palmer 1929-
(soccer) Arnold Mühren 1951-
(soccer) Steven Defour (a.k.a. Arnold) 1988-
Notable Musicians:
2 composers, 1 singer/musician
Arnold Schoenberg 1874-1951
Peter Warlock (a.k.a. Arnold) 1894-1930
Waylon Jennings (a.k.a. Arnold) 1937-2002
Notable Politicians and Statespeople:
2 politicians
Teun Struycken (a.k.a. Arnold) 1906-1977
Al Gore (a.k.a. Arnold) 1948-
Olympic Medalists:
1 bronze, 1 gold, 1 gold/bronze/silver, 1 silver, 1 silver/bronze/gold
(gold) Arnold Jackson 1912 1500 m
(silver/bronze/gold) Clas Thunberg (a.k.a. Arnold) 1924; 1928 speed skating
(silver) Maxwell Deacon (a.k.a. Arnold) 1936 ice hockey
(bronze) Arnold Vanderlyde 1984; 1988; 1992 boxing
(gold/bronze/silver) Bronte Barratt (a.k.a. Arnold) 2008; 2012 swimming
Other Leaders:
1 president
President Arnold Rüütel 2001-2006 Estonia
Saints:
4 saints, 1 blessed
Saint Arnold ?-800
Saint Arnold of Soissons 1040-1087
Saint Arnold of Selenhofen 1095-1160
Saint Arnold Janssen 1837-1909
Blessed Arnold Rèche 1838-1890
Swiss Presidents:
1 president
Arnold Koller 1990; 1997
Title Characters:
1 song
(song) Arnold Layne 1967 Arnold Layne