In my info.plist, I added a key \"Fonts provided by application\" and added EdwardianScriptITCStd.otf
The font name to be used seems to be the "Family name" in the Font Book. I tried the PostScript name, but it does not always work. Family Name, as far as I can tell, has always worked up until now.
You can check this information, as mentioned in the above answer, inside Font Book, select the font and press cmd+I.
Hope this helps...