I have 2 names on my passport, and it'll stay this way until I bother to change the passport. Old name (the one beside the picture) is the one I use for almost everything.

I tried the new name once when booking air ticket, but the problem was that it didn't match the FF name (Yeah didn't bother to change that too), so I was asked to call reservations instead of continue with online booking.

I'll stick with the name on the photo page of your passport.......