Poster Anthony

Twilight Saga. Edward Cullen's name?

I have read the WHOLE SERIES over and over and over again. But I saw this poster on a mal that showed, "Full Name: Edward Anthony Masen Cullen". Heck, I understood but what confuses me was, where the hell did 'Anthony' came up? Masen was his mother's surname, but, I HAVE NEVER read ' Anthony' in the book. I was not even mentioned once! And please, guys, to end my frustration, pls, answer me..:( Where 'specifically' was it written? What book? What chapter? what page? Or a link in a site? Was it told by S.Meyer? Thanks! I'm hoping for your answers! <3
BACK OFF you people who do not even know how to answer tactfully! have some respect!

I'm sorry to say Anthony is just his middle name, I don't think we know were it came from.
I'm sure Stephenie Meyer probably knows though lol!
But I read it in a personal corespondent between a fan and Stephenie Meyer and I'm sure thats were everyone got his full name, here is the link:
http://www.twilightlexicon.com/?p=34
Hope that helps!