I'm like you- I really like
Lucy, but I'm not fond of
Lucille. I think
Lucy can definitely stand on its own.
Also, if you don't like
Lucille,
Lucy can be used as a nn for these names instead:
LuciaLucianaLucienneLucillaLucinaLucindaLucindeLucineLucreceLucretiaLucreziaLucyna
Anything you like?