Mnemosyne is a Titaness, one of the original three muses and mother to the nine muses you usually hear about. She is the creator of logic, reason, language, and memory. All human thought and communication spring from her.
When I was a sophomore in high school, some school held their debate tournament "in honor" of Mnemosyne. Afterwards I did some research onher, and since then I've used the name fairly often.