I am loving [name_f]Lilia[/name_f] right now! It actually means [name_f]Lily[/name_f] 
[name_f]Lila[/name_f]
[name_f]Liliane[/name_f] or [name_f]Lilianne[/name_f]
[name_f]Lilibeth[/name_f]
[name_f]Liliosa[/name_f] (A new discovery of mine – very pretty and fun!)
[name_f]Delilah[/name_f]
[name_f]Galilee[/name_f]
[name_f]Kalila[/name_f]
[name_f]Talila[/name_f]
[name_f]Susannah[/name_f] and [name_f]Shoshana[/name_f] both mean [name_f]Lily[/name_f], but I am not sure if you are looking for names that lack relatively intuitive nn potential.
You could also do something with a combo, like… [name_f]Elizabeth[/name_f] [name_f]Liana[/name_f]. Li from [name_f]Elizabeth[/name_f] and ly from [name_f]Liana[/name_f].
*You could use [name_f]Lily[/name_f] as a nn for [name_f]Amelia[/name_f], but I actually think they sound just fine together. Maybe you could do [name_f]Amelia[/name_f] nn [name_f]Mia[/name_f]. [name_f]Lily[/name_f] & [name_f]Mia[/name_f] is really cute!