Board Thread:Speculation House/@comment-4403232-20140411230237/@comment-16502426-20140501193328

Yeah, I just found it. It looks official to me. The fact that he said that it is "just a name, not a plot point" shows that he indeed was spoiling something, but just a name, which really doesn't matter.

If Emerald were a placeholder, he would have either not responded, or said something along the lines of 'nothing is spoiled'.

The fact that he made the distinction that a name isn't much of a spoiler implies that Emerald is the real name.