Oh wow, 5 girls - how lovely!
I like Arabella. Veronica is quite refreshingly different nowadays and Ronni is cute for the right child. Not keen on Margot.
Other ideas in a similar vein:
Annabella, Angelica, Aurelia, Araminta, Ariadne, Adeline, Beatrice, Cassandra, Calliope, Clarissa, Caroline, Charlotte, Cassia, Cecilia, Claudia, Catherine, Delilah, Daphne, Eleanor, Evangeline, Elizabeth, Emmeline, Francesca, Florence, Felicity, Fenella, Gabriella, Genevieve, Hermione, Isadora, Isolde, Jessamy, Jacinta, Jacqueline, Josephine, Joanna, Katrina, Liliana, Lucinda, Margaret, Madeleine, Miranda, Melissa, Natasha, Natalie, Natalia, Ophelia, Octavia, Philippa, Penelope, Rosemary, Rosanna, Stephanie, Serena, Susannah, Sylvia, Tabitha, Tallulah, Tamara, Victoria, Vanessa, Ysanne, Yolanda