They're all nice name. All very popular but that doesn't mean there are going to be hundreds. Charlotte is more popular than Olivia at our school at the moment, despite the lists. I would say that a year group of 45 or so children has, on average, 1 Olivia, 2 Charlottes and maybe a Georgia but less likely, especially in younger years.
Similar names that are less popular that you might like:
Bethany, Catherine, Cassandra, Elizabeth, Francesca, Felicity, Florence, Georgina, Gabriella, Henrietta, Hermione, Imogen, Joanna, Juliette, Louisa, Lydia, Miranda, Melissa, Madeleine, Natasha, Natalie, Ophelia, Rebecca, Rhiannon, Samantha, Tabitha, Victoria, Vanessa