I adore this name, but I'm sure that's not a surprise at all. I do worry that for prn and spelling and general "out there-ness" that it would be better as a MN, but go for it!
I prefer it with simpler things. I'm listing it as a MN, but I think these combos would all work with the
Mnemosyne as the FN.
Themis MnemosyneAdelle MnemosyneJune MnemosyneViola /
Violet MnemosyneClare MnemosyneRhea MnemosyneCora MnemosyneDaphne MnemosyneHelen Mnemosyne