Mid 70s. The register went along the lines of;
Sarah, Michelle, Kelly, Sarah, Sarah, Sarah, Sarah, Michele, Nicola, Michelle, Nicola.
David, David, David, David, David, David, Robert, Robert, Robert, James, James, James, Neil, Neil, Neil, Stuart, Stewart, Andrew, Andrew. And another David.
Mid 90s it was more;
Emma, Bethany, Bethan, Rebecca, Emma, Emily, Emily, Bethany, Amy, Amy, Emily, Georgia, Georgia, Bethany, Georgina, Emma, Rachel.
James, Jamie, Andrew, Jamie, Ben, Ben, Benjamin, Benedict, Sam, Samuel, Sam...