Namesakes
Austrian Chancellors and Presidents:
1 chancellor
(chancellor) Otto Ender 1930-1931 
Austrian Dukes and Emperors:
1 duke
Duke Otto the Merry 1330-1339
Danish Prime Ministers:
3 prime ministers
Tage Reedtz-Thott (a.k.a. Otto) 1894-1897
Otto Liebe 1920
Jens Otto Krag 1962-1968; 1971-1972
Fictional Characters from Television:
1 character
Otto Flick 1982 'Allo 'Allo!
German Chancellors and Presidents:
1 chancellor
(chancellor) Otto von Bismarck 1871-1890
German Kings and Holy Roman Emperors:
4 king-emperors
King-Emperor Otto I the Great 936-973
King-Emperor Otto II the Red 961-983
King-Emperor Otto III 983-1002
King-Emperor Otto IV 1198-1215
Hall-of-Famers:
1 football
(football) Otto Graham 1965
Hungarian Kings and Queens:
1 king
King Ottó III of Bavaria 1305-1308
Hurricanes and Tropical Storms:
2 hurricanes, 1 storm
Storm Otto 2004
Hurricane Otto 2010
Hurricane Otto 2016
Nobel Prize Winners:
6 chemistry, 3 medicine, 1 physics
(chemistry) Otto Wallach 1910
(medicine) Otto Fritz Meyerhof 1922
(chemistry) Heinrich Otto Wieland 1927
(chemistry) Adolf Windaus (a.k.a. Otto) 1928
(medicine) Otto Heinrich Warburg 1931
(medicine) Otto Loewi 1936
(physics) Otto Stern 1943
(chemistry) Otto Hahn 1944
(chemistry) Otto Diels 1950
(chemistry) Ernst Otto Fischer 1973
Norwegian Prime Ministers:
2 prime ministers
Otto B. Halvorsen 1920-1921; 1923
Otto Blehr 1921-1923
Notable Artists:
2 painters, 1 fashion designer
Georg von Rosen (a.k.a. Otto) 1843-1923
Otto Hesselbom 1848-1913
Karl Lagerfeld (a.k.a. Otto) 1933-2019
Notable Athletes:
1 football, 1 soccer
(football) Otto Graham 1921-2003
(soccer) Otto Rehhagel 1938-
Notable Evildoers:
1 persecutor
Adolf Eichmann (a.k.a. Otto) 1906-1962
Notable Politicians and Statespeople:
1 politician
Otto van Rees 1823-1892
Notable Scientists and Inventors:
1 chemist, 1 naturalist
Otto Friedrich Müller 1730-1784
Otto Hahn 1879-1968
Olympic Medalists:
4 silver, 3 bronze, 1 bronze/gold, 1 gold/silver, 1 silver/bronze
(silver) Otto Herschmann 1896 swimming - 100 m freestyle
(silver/bronze) Otto Wahle 1900; 1904 swimming - 1500 m freestyle; swimming - 200 m obstacle; swimming - 400 m freestyle
(bronze) Otto Nilsson 1908 javelin throw
(silver) Otto Trieloff 1908 medley relay
(bronze) Otto Scheff 1908 swimming - 400 m freestyle
(silver) Otto Fahr 1912 swimming - 100 m backstroke
(silver) Otto Neumann 1928 4x400 m relay
(gold/silver) Otto Cordes 1928; 1932 water polo
(bronze) Rudolf van Feggelen (a.k.a. Otto) 1948 water polo
(bronze/gold) Ottó Boros 1956; 1960; 1964 water polo
Other Leaders:
2 prime ministers
Prime Minister Otto Strandman 1919 Estonia
Prime Minister Otto Tief 1944 Estonia
Other Royalty:
1 king, 1 prince consort
Otto of Greece 1832-1862 Greece
Claus of the Netherlands (a.k.a. Otto) 1980-2002 Netherlands
Saints:
1 blessed, 1 saint
Saint Otto of Bamberg 1060-1139
Blessed Otto Neururer 1882-1940
Swiss Presidents:
1 president
Otto Stich 1988; 1994
Title Characters:
2 books
(book) Otto 2014 Etta and Otto and Russell and James
(book) Otto Laird 2014 The Restoration of Otto Laird
Tolkien's Characters:
1 character
Otto Boffin (m)