Another "Linda" here too, born in 1949, dropped the 'duh' when I was about 14. I just go by Lin now. growing up in Southern California, I was the only Linda in my class (large) class. We had a Belinda and a Melinda, and even a Jolinda. The 2 classes ahead of me were 'linda' packed however. I guess out near Hollywood the trend peaked earlier.
However, there were 3 of us girls that shared the same birthday. Sandy and Sharon were twins and I was older than one and younger than the other.