I don't know anyone with the name
Lily, but I do know a
Rose (her full name is
Rosalie and she gets called either
Rose or
Rosie). She's my maternal grandmother's younger sister and quite a loud person and a real go-getter, even though she's in her 60's now! Both names a lovely and I'd have a hard time choosing between the two myself, but I'd probably be more inclined to go with
Lily, since no one in the family has that name. That said,
Lily is very popular right now for a fn and
Rose is very popular as a mn, so it would be lovely to see
Rose as a fn for a little girl. I also love
Rosie as the nn for
Rose, it's so sweet. All in all, my vote goes to
Rose.