I'm 55.
My 2-class primary school had in our year 4 Mandy, 4 Matthew, 3 Helen, 3 Claire, 3 Jonathan, 2 Simon, 2 Julie, 2 Robert, 2 David
At secondary school were several each Rachel, Susan, Lisa, Donna, Karen, Gillian, Deborah, Lorraine, Jennifer, Victoria, Catherine, Sara/Sarah (we were plebs who pronounced them identically) Sharon, Tracy, Christine, Joanne, Emma, Elizabeth, Alison, Christopher, Andrew, Peter, Richard, Michael, Ian, Dean, Lee, Mark, Paul, Stephen