Kant, Immanuel
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Oh, firefly, I couldn't pass it up.
okay, but, since it's a double, let me add
Kung Fu-zi (or K'ung-fu-tzu, there are various spellings)--Confucius
Good one firefly.
Leibniz
or, Lenin
Marx, Karl (or Groucho, who was also something of a philosopher)
(Since Nietzsche had also been used for the F, I'm going to slip in Nicolo Machiavelli, before I go onto O)
Ockham, William of
Sartre, J-P. (arrrrgh = pipped) but, an excellent choice bombom!!
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Turing, Alan