Elaine doesn't mean "sun" OR "beautiful waterfall". It actually and old French form of
Helen, and
Helen means "torch" or "moon".
For
Evelyn, the meaning is uncertain, however, its associated with the meaning "bird".
If you go on the Opinions Board like
Andy said, and just tell them to pick based on meaning, they would be happy too :D
Good Luck
-
Lala