Apologies for not hanging around as much lately. (I've been busy playing with my new holiday toys!)
I was afraid that would happen when I posted the suggestions gathered from the old thread. But if it makes you feel better, the suggestions do seem both fewer and more focused this time around. Probably because we're now branding an entire line of browsers, not just New Moon (or even New Moon & Serpent, since Navigator and MailNews are now included as well).
We also seem to have settled on a "variations on a theme" model: an overall theme to bind the entire line together: RFox, Salto, Surf(er), *is, Windows code names, whatever; with a suffix or second name, Latinized root (i.e., @LoneCrusader's original Lunaris/Draconis suggestion), etc. to distinguish them. So I think we've made some progress, despite the low signal/noise ratio.
The only clear guidance I remember getting from @roytam1 is that he considers these multiplatform browsers, not specifically Windows XP (or even Windows overall) browsers. They're intended to run on anything from XP thro(ugh) 10, and are buildable for Linux too. That said, Windows code names (Whistler, Lonestar, etc.) are probably fine; I'd just avoid obvious references to Windows in names or logos.