Wow, that didn't take very long. Congratulations to Five Become One visitor Kurt for being the first to comment with the last names of all five of the Girls (which he even did in alphabetical order...nicely done).
The correct answer of course was...
As promised, Kurt has won a single ticket to see the Girls during their final show of the Reunion Tour this Tuesday at the Air Canada Centre at 7:30. Congratulations, and thanks so much to everyone else out there who has made this site such a pleasure to uphold. More to come.