One of my names is Katherine, though it is not the name I am known by. My DIL is also called Katherine, spelt the same way. It seems to be a name that doesn’t go out of fashion.
Names from my youth that aren’t much used nowadays are Valerie, Judith, Anne, Margaret (although I do know of a child called Margaret), Brenda, Janet, Patricia, Rosemary - I could go on and on. Boys’ names don’t seem to change so much. There are still young boys named Edward, James, Stephen, or David. But I don’t know of any called Derek, John, Donald or Eric.
Names popular in my grandparents’ generation but unpopular in that of my parents or mine are now popular again - for example Charlotte, Emily, Harriet. When I was a child in the 1940s, my best friend was called Harriet, which was very unusual then. Now there are Harriets all over the place!