.... Myth sounds like someone trying to say "Miss" with a lisp or something.... Besides, it's problematic for other reasons too. To me Sparkle and Light Angel sound like My Little Ponies... ^_^
I watched a docu on the mythical Troy, and in the area where people think it mught be, the population pronounced "Trojan" like "troy-an" with the soft "j". so I can see where "Troia" came from...... and my take on the Italian translation? Couldn't care less, as that's not where her name came from.
But personally I'd prefer her name be Darkstar, although I know that has it's own issues (apart from having two "star" names in the family... well three with Redstar -- if he still exists...lol)