Namesakes
French Presidents and Prime Ministers:
2 prime ministers
(prime minister) Ernest Courtot de Cissey (middle name Octave) 1874-1875 
(prime minister) Raymond Barre (middle name Octave) 1976-1981
Notable Writers:
1 author
Octave Mirbeau 1848-1917
Other Leaders:
1 prime minister
Prime Minister Pierre de Witasse (middle name Octave) 1944-1948 Monaco