What are we talking about, by the way?
This is the case where a woman named Casey Anthony claimed her daughter Caylee was kidnapped by a nanny named ZG.
In fact it was alleged Casey had killed her little girl, and set it up as a kidnapping. This was in 2008.
I don't think it's strange, it's quite possible Anthony could have seen that name on a sign in sheet at the leasing office, and used it.