I like
Nefertari. I think it's more usable than
Nefertiti, actually.
My first instinct is to say that it's usable as a mn only, but I've met people with names that seem less usable but actually work fine in real life. Plus I'd definitely like to meet someone named
Nefertari, so I'd say it's usable.
My cat
Nefertiti is always called Nef / Neffy / Neffie, and that would work for
Nefertari too. There's also Tari, which sounds more like a "human name".