I'd probably choose Marian for a girl. I also quite like Marjorie and Suzanne
For a boy I'd probably go with Dale
Extinct since 1994, are Graeme, Horace, Iain, Leigh, Melvyn, Nigel and Royston for boys.
And for girls, the list includes Bertha, Beverley, Carol, Carole, Doreen, Gail, Gertrude, Gillian, Glenys, Glynis, Hilary, Jeanette, Jill, Kay, Kerry, Lesley, Lindsay, Lyndsey, Lynne, Lynsey, Mandy, Maureen, Muriel, Phyllis.
The at-risk names for girls were Annette, Beryl, Brenda, Carolyn, Cheryl, Dawn, Debbie, Debra, Denise, Diane, Donna, Doris, Edna, Freda, Geraldine, Gladys, Gwendoline, Hilda, Janet, Janice, Jean, Jordan, Kirsty, Lindsey, Lorraine, Lynda, Lynn, Marian, Marion, Marjorie, Marlene, Maud, Mildred, Norma, Pamela, Pauline, Sheila, Shirley, Suzanne, Thelma, Tracey, Tracy, Toni and Yvonne.
Boys
Barry, Cecil, Clarence, Claude, Clifford, Cyril, Dale, Donald, Gary, Garry, Glen, Glenn, Gordon, Graham, Howard, Keith, Leslie, Neville, Norman, Rodney, Stewart, Stuart and Trevor.
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title amended by MNHQ at OP's request