Hmmm ... you're not giving much to work from!
I think these names were popular for girls at the start of the 20th century in case your taste in time period is similar for girls:
Anne, Annie, Alice, Agnes, Agatha, Alma, Avis, Blythe, Beryl, Bertha, Belle, Clara, Connie, Constance, Cecily, Clarice, Dorothy, Daphne, Diana, Dilys, Dora, Dorcas, Deirdre, Emma, Ellen, Ella, Emily, Edith, Esme, Elsie, Enid, Ethel, Erica, Faith, Florence, Frances, Fleur, Grace, Georgina, Gloria, Helen, Helena, Hilda, Hilary, Hazel, Henrietta, Harriet, Ivy, Iris, Ida, Ines, Irene, Judith, Jane, Joan, Jean, Janet, Jessie, Josephine, Kathleen, Kate, Lily, Lucy, Lydia, Margot, Margaret, Maggie, Mary, Molly, Maisie, Martha, Nancy, Nell, Nelly, Olive, Olwen, Peggy, Polly, Patience, Prudence, Queenie, Ruth, Rose, Rita, Sara, Sarah, Sally, Theresa, Tessie, Una, Violet, Victoria, Winifred
Otherwise - my own favourite names:
Amy, Amber, Amberley, Averil, Astrid, Avery, Arabella, Aubrey, Anoushka, Anika, Alyona, Aria, Ava, Bronte, Cassandra, Cassidy, Calliope, Calista, Calypso, Cerys, Carys, Delphi, Dixie, Devon, Effie, Eva, Ebony, Felicity, Francesca, Fallon, Giselle, Gabriella, Hannah, Jessica, Jessamy, Joanna, Juliette, Kiki, Lyra, Lara, Lyric, Miranda, Matilda, Mila, Mala, Nicole, Natasha, Octavia, Piper, Quinn, Romilly, Rosina, Rowena, Robyn, Rhiannon, Rhiannyd, Sorcha, Saffron, Savannah, Sorrell, Stephanie, Sophia, Saskia, Thea, Taryn, Tansy, Verity, Xanthe, Xanthippe, Yvette, Zeryn, Zia, Zara