It wasn't possible (due to false positives) to search smoe (like Berkeley, David Lewis, William James, and Bacon--Berkeley and Lewis would have surely been in the top 30), but for the rest the number of articles in which they appear tracks fairly well some earlier polls run here, though with an obvious skew to the major figures in 20th-century "analytic" philosophy. I searched only philosophers no longer alive (some living figures would have made the top 30).
1. Plato (1012)
2. Aristotle (1001)
3. Kant (801)
4. Hume (590)
5. Descartes (542)
6. Leibniz (451)
7. Locke (442)
8. Frege (395)
9. Socrates (391)
10. Aquinas (374)
11. Wittgenstein (371)
12. Quine (350)
13. John Stuart Mill (347) (did some checking for false positives)
14. Hilary Putnam (331)
15. Hegel (306)
16. Russell (303) (did some checking for false positives)
17. Kripke (298)
18. Carnap (296)
19. Augustine (287)
20. Hobbes (279)
21. Spinoza (261)
22. Rawls (260)
23. Marx (226)
24. Husserl (217)
25. Heidegger (211)
26. Goodman (210)
27. Nietzsche (181)
28. Rousseau (179)
29. Nozick (167)
29. Duns Scotus (154)
30. C.S. Peirce (149)
A few others that were searched: Bentham (143), Fodor (143), Dewey (131), Sartre (126), Cassirer (99), Fichte (96), Epicurus (93), Kierkegaard (93), Schopenhauer (92), Bergson (83), Democritus (82), Adorno (61), de Beauvoir (50).
Among living figures, Habermas was at 113 and Noam Chomsky only at 94.
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