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Getting the knower of names to tell you Mephistos' true name isn't linked to wisdom or intellitence. I think you have to buy her true name, then you can force her to reveal Mephistos' true name.
I had so much extra gold by the end of HOTU both times I played through (first with a monk, then with a fighter) that I just went ahead and bought everyone's true name that I could, just to see what the different possible outcomes would be. With his true name, you can banish Mephisto from the prime material plane forever, make him your slave and terrorize the world yourself and maybe another outcome, but I forget. I ended up fighting him too, just because with a monk and a fighter, it seemed like the way to go. If you are lawful good, then the banishing might be the way to go, since even if killed, he just goes back to the outer planes of Hell, or where ever, and potentially he could return to attack the world again. The banishment is forever, so that removes one him as a direct threat. You still get the XP points for that too.
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