Thanks for the reference! I'm a bit sceptical, though: where the OP cites 'the rising popularity of
Delilah and
Lilith', I think that the presence of Lil- and -lil- in both is likely to be more influential than biblical references. And a lot of people, including a surprising number of Christians, are familiar with the Bible stories they like and don't know about the others; don't read widely, in fact. So
Lilith would be just another name to them, and a preferable, because less popular, version of
Lily.
Delilah ... even in the
Tom Jones song, she's an unfortunate namesake. So I don't know about that one!