I really know this sort of crap out the top of my head as I "enjoyed" a humanistic school education including latin and greek lessons (the old greek, though).
However, Troy is as Greek as Joe or Brad Pitt is a Greek name. Hellen is actually Helena, again this is just the English translation. I better shut up now.
For more superficial information, please consult wikipedia:
http://en.wikipedia.org/wiki/Troy