Libby Jayne works well I think.
Or, how about:
Libby Jade, Libby Jemima, Libby June, Libby July, Libby Juno, Libby Juniper, Libby Jerica, Libby Jocasta
, Libby Jamilia, Libby Jessa, Libby Jessamy, Libby Jayla, Libby Jada, Libby Joanne, Libby Justine, Libby Judith, Libby Jocelyn, Libby Joy.
And for the other name:
Abbie, Annie, Allie, Aubrey, Audrey, Ashleigh, Bonnie, Bessie, Briley, Carly, Charley, Callie, Cassie, Carrie, Casey, Cindy, Chelsea, Connie, Chloe, Dolly, Darcey, Danni, Demi, Delphi, Dulcie, Emmie, Ellie, Evie, Elsie, Edie, Esme, Effie, Flossie, Florrie, Georgie, Gabby, Hollie, Honey, Heidi, Hallie, Hayley, Hadley, Hattie, Hettie, Indie, Izzy, Julie, Jessie, Jenny, Josie, Jodie, Jackie, Katie, Kayleigh, Kelly, Kerry, Kylie, Kelsey, Keeley, Kenzie, Kirsty, Kristie, Keltie, Lily, Lucy, Lexie, Lacey, Lottie, Lindy, Leslie, Lori, Mary, Maggie, Marie, Maisie, Mindy, Minnie, Molly, Millie, Macie, Miley, Marley, Maddie, Minty, Misty, Nancy, Nellie, Ollie, Poppy, Polly, Phoebe, Penny, Posy, Queenie, Ruby, Rosie, Ryleigh, Sophie, Sammi, Sadie, Shelby, Sydney, Sylvie, Sally, Susie, Tilly, Tallie, Tansy, Vashti, Wendy, Winnie, Zoe.