So... back to the original topic. (which will seem off topic to the preceding posts)
My nomination for Aona's shard name is Unity.
Shu-Keseg, the parent religion of Shu-Dereth and Shu-Korathi, is based on Keseg's teachings of unity. It just seemed to be a strong enough recurring theme to deserve a mention. Plus it's mildly all encompassing.
The pool can be explained through this idea of unity, in a way similar to the idea of harmony. Based on Andrew's theories (Which I support whole heartedly), when Elantrians go and dissolve in the pool, in what I believe to be Aona's pool, they join Aona. Their Splinter, or whatever it is that gives them their power, returns to her, thus they have unity with her. I like to think of it in the Dula way of the Dor. It is the life force that motivates all, and as you die, the life force returns, and has unity with the rest of the Dor.
I also felt like the Fall of Elantris, and all the broken Aons were caused by a disunity with the geography.
It's evidenced in the religions and in certain aspects of the magic, plus Shuden talks about Unity specifically, so I think it has a decent chance of being the right name.