Namesakes for LEO:
  Characters in Greek Mythology: 1 character
      Leo
  Nobel Prize Winners: 1 physics
      (physics) Leo Esaki   1973
  Oscar Award Winners: 1 director
      (director) Leo McCarey   1937, 1944
  Bishops of Rome and the Popes: 13 popes
      Pope Leo I the Great   440-461
      Pope Leo II   682-683
      Pope Leo III   795-816
      Pope Leo IV   847-855
      Pope Leo V   903
      Pope Leo VI   928
      Pope Leo VII   936-939
      Pope Leo VIII   963-964
      Pope Leo IX   1049-1054
      Pope Leo X   1513-1521
      Pope Leo XI   1605
      Pope Leo XII   1823-1829
      Pope Leo XIII   1878-1903
  Roman and Byzantine Emperors: 6 emperors
      Emperor Leo I   457-474
      Emperor Leo II   474
      Emperor Leo III   717-741
      Emperor Leo IV   775-780
      Emperor Leo V   813-820
      Emperor Leo VI   886-912
  Saints: 21 saints, 4 blessed
      Saint Leo Tanaka
      Blessed Leo Suchiemon
      Blessed Leo Satsuma
      Saint Leo of Troyes
      Saint Leo of Sens
      Saint Leo of Rouen
      Saint Leo
      Saint Leo of Nonantula
      Blessed Leo Nakanishi
      Saint Leo of Melun
      Saint Leo Luke
      Saint Leo of Lucca
      Saint Leo
      Blessed Leo Kombiogi
      Saint Leo Karasuma
      Saint Leo the Great
      Saint Leo of Catania
      Saint Leo IX
      Saint Leo VIII
      Saint Leo VII
      Saint Leo VI
      Saint Leo V
      Saint Leo IV
      Saint Leo III
      Saint Leo II
  Sports Stars: 1 baseball, 1 football, 1 hockey
      (baseball) Leo Durocher   1994
      (football) Leo Nomellini   1969 
      (hockey) Leo Boivin   1986
  Notable Writers: 1 author
      (author) Leo Tolstoy   1828-1910