It bothered me a little that while the oldest and the youngest sisters are called Neena and Nonna, the middle one was given a structurally different name—Noriella. Seems odd for the parents to name their kids inconsistently.
So… Neenaeve (always wanted to steal this name), Noriella, Nonnalen. Makes much more sense. Neena and Nonna gals just prefer their short names over the longer ones.