Joss Whedon announced in January 2005 that Faith's surname was "Lehane," and this would be used in all future products, starting with Eden Studios' Buffy the Vampire Slayer role-playing game. The name appears in Eden's books and is considered to be canonical. Whedon explained at the time:
There was this role playing game or something. They said she hadda have a last name for her so I chose Lehane 'cause I wanted something Southie, just as you thought. — Joss Whedon at whedonesque.com