Some of these 80s names have stayed in use though. I currently know (under the age of 13) 3 Sarahs, 2 Rachels, 4 Rebeccas, 1 Samantha, 1 Nicola, 2 Chelseas, 2 Stephanies, 1 Natalie, 2 Natashas, 7 Georginas, 3 Catherines, 4 Eleanors, 2 Amys, 1 Kate, 1 Mary, 3 Emmas, 4 Alexes, 2 Mirandas, 1 Anna, 2 Elizabeths, 2 Lucys, 1 Naomi, 1 Philippa, 2 Madeleines, 4 Katies, 1 Zara, 1 Gemma, 1 Sadie.
I don't think of any of those as 'known but not used' at all.
I can't remember my first primary class (1988) very well at all but, from what I can remember, we had 2 Rebeccas, 2 Amys, Laura, Sarah, Nicola, Kerry, Elizabeth, Kimberly, Erin and Lois. Most of those are, I would say, still used. I think you have to either go back a bit or pick names that were trendy then rather than classic.
My list (sorry for the repeats)
Anita, Annalise, Agnes, Annette, Anne, Alma, Avis, Ada, Amanda, Angela, Antonia, Adrienne, Belinda, Bertha, Beryl, Bessie, Cecily, Celia, Claudette, Claire, Caroline, Diane, Deborah, Denise, Donna, Dawn, Delia, Doris, Dorcas, Dinah, Erica, Ethel, Enid, Fiona, Freda, Gertrude, Gloria, Gwedoline, Hilda, Hilary, Irene, Ida, Julie, Jean, Joan, Justine, Judith Judy, Karen, Kimberly, Kelly, Kerry, Kylie, Kirsty, Laura, Linda, Leslie, Marie, Michelle, Monica, Marjorie, Muriel, Maude, Mildred, Nora, Nadine, Paula, Pauline, Priscilla, Rita, Sharon, Stacy, Shelby, Shanice, Tara, Tonya, Tracy, Tiffany, Ursula, Virginia, Vivian, Wendy, Yvonne, Yvette