For a girl it might be nice not to have an a ending for variety, I like Astrid and Genevieve - there is also Marianne, Persephone, Rosalind/Rosamund, Madeleine, Verity, Christabel, Jasmine, Lucienne, Lois, Ines, Cecily, Frances, Hermione, Imogen, Emmeline, Eloise
Or for another a end then Clara, Stella/Estella, Cecelia/Celia, Honor, Leonora, Serena, Cassia, Diana, Miranda, Flora, Seraphina, Augusta, Viola, Julia, Alexandra, Emma, Laura
Boys - Lucian, Julius, Cassian, Alexander, Alistair, Raphael, Gabriel, Josiah, Elijah, Elisha, Joshua, Maximilian, Leonardo, Atticus, Francis, Sebastian, Benedict, Alberic, Jonathan, Dominic, Blaise, Guy, Hugh, Rafe, Lorne, Rollo, Marcus, Lucas, Gideon, Nathaniel, Tobias, Jeremiah, Noah