I think Envy is a pretty mysterious character name!
For some other ideas, here are my favorites:
[name_f]Roxanne[/name_f] (maybe [name_f]Roxy[/name_f] or [name_f]Roxie[/name_f] as a nickname)
[name_f]Elisabeth[/name_f] ([name_f]Beth[/name_f] as a nickname)
[name_u]Raven[/name_u]
[name_f]Katrina[/name_f]
Katiness
[name_f]Primrose[/name_f]
[name_f]Rosette[/name_f]
[name_f]Rose[/name_f]
[name_f]Annabeth[/name_f]
[name_f]Tori[/name_f]
[name_f]Natasha[/name_f]
[name_f]Katryn[/name_f] (kate-TRIN)
[name_f]Alexandria[/name_f]
[name_f]Natalie[/name_f]
Those are my ideas, I hope this helped!