Omg yes! In the 70s, the only middle name for Sarah was Louise or Jane. Every Sarah I know is one or the other, including me. Numerous Elizabeths and Clares, too.
Always loads of us in every class, and at 6th form there was actually another girl with the same first, middle AND surname as mine. I only realised when looking for A level results on the board - highly confusing at first, looking at hers (different subjects) before spotting my own!
Mind you, my mum was under a lot of pressure from her in-laws to call me Hilary so I guess I shouldn't complain...