so it's more like 99%
Actually, for the majority of the game, it would be between 99.0% and 99.9%.
Well, I still maintain no significance for Nu beyond a simple mythological similiarity. This similarity, however, in no way requires it to have been concious on the part of the writers: myths tend to follow general trends, or have similarities, even in disconnected cultures. In writing Chrono Trigger, the writers likely thought of the same sorts of things that those who dreamed up myths did in ancient days, and Nus are thus similar, as I said, to Nymphs and spirits of the earth.
One cannot, I do not think, draw conclusions based upon similarities of the name. One might say it stems from Zen, but another from an Egyptian Heiroglyph (^^^... that one, right?); to me, Nu is the letter N in Greek. I seriously doubt that any of these are the root of the name, however. I think Occams Razor would be well applied here - the name of Nu is not something that should be made overly complex.