I'm definitely partial to Genealogy of the Holy War as a title. It works in its stellar, game-defining game mechanic while still sounding interesting and honestly just baller as hell. I mean... ya'll can go ahead and have your little awakening or whateva it is ya want to do... meanwhile, we'll be having our m'fin HOLY WAR up in here, and with OUR CHILDREN too, sucka! Nah, but actually Awakening's a swell title, or something...
And honestly, I really don't care for Radiant Dawn as a title. Yeah, it obviously hearkens back to Path of Radiance and all--which I do really like as a title--but Radiant Dawn itself just sounds... a bit too contrived for my taste. but that's just like, my opinion, man, and also apparently only mine alone... alas...
also I just call FE12 "New Mystery of the Emblem" so la la la didn't see that awful name...
Oh, and I think Thracia 776 makes sense as a name from a marketing standpoint--at the time around its announcement and release, it could potentially resonate very well with those that played FE4, and blah blah blah. Maybe it hasn't held up over time very well...