If Chisholm’s Paradox is sound, the conclusion that Adam could occupy Noah’s qualitative role entails haecceitism. This is because Noah’s qualitative properties include, not only Noah’s intrinsic properties, but also Noah’s extrinsic properties (e.g., being such that there are seven continents), which suffice to fix the qualitative character of the world. As result, if Adam could instantiate Noah’s actual qualitative properties, then the world in which he does so must be qualitatively just like the actual world. Such a possibility therefore entails that some maximal possibilities differ haecceitistically.