I don't care much for
Juliana, being the
Julia freak I am. =P I find the -ana unnecessary, much like
Liliana,
Adriana,
Emiliana, etc. I met a Lydiana once, actually. It's quite a trend, and I think
Juliana falls into that category. I don't think it's over the top, but a little pretentious, and perhaps a little predictable.
I don't think
Cecilia would become too popular. I'm not a
Cecilia fan anyway, but I wouldn't worry about it becoming another
Ava.