Lo,
Lola,
Lore,
Leia, Lei, Leili?
Lulu is cute, and I don't think it's too much of a stretch (although it is a bit of a stretch).
I don't think
Lorelei really goes with
Matilda and
Rosemary though, it's too smooth and watery and
Matilda and
Rosemary are more old-fashioned and dusty.