Here is a sample list of important philosophers in alphabetical order to choose from:
Adler, Anaxagoras, Antisthenes, Aristotle, Aurelius, Bacon, Camus, Castaneda, Chomsky, Confucius, Darwin, Democritus, Descartes, Diderot, Diogenes, Durkheim, Engels, Epicurus, Erasmus, Foucault, Gandhi, Hegel, Heidegger, Hobbes, Ionesco, Kant, Kierkegaard, Lenin, Levi-Strauss, Machiavelli, Marx, Nietzsche, Plato, Rousseau, Sartre, Schopenhauer, Socrates, Spinoza, Trotsky, Voltaire, Weber, Wittgenstein, Xenophon