I would say it's probably a mistake in the Guide - Edit 1
Before modification by Etzel at 27/01/2010 03:33:08 PM
Or what if Ethenielle knows and carries these fragments with her?
Ethenielle Kirukon Materasu is not the current Queen of Kandor. I don't know how she can carry anything or show it to Rand at this point since she doesn't exist right now.
I think in the main series the full name is never given, it's just mentioned in the Guide and in SaSG. However, contrary to the Guide, RJ wrote SaSG himself and IIRC after the Guide. Thus I would say this rather indicates that the name in SaSG is the correct one. I also rather doubt that their are two Queens Ethenielle from different Houses, since RJ obviously wanted to imply that this text is contemporary to the time of the main books.