I've lost track of how many ways people spell Caitlin. I have no idea what's wrong with the received spelling, which is quite pretty.
Mashinka, I read somewhere that around midcentury half of the girls born in America were named Mary. It's many fewer now. The Social Security site could tell us by exactly how many.
Interesting that Oliver makes both the US and British lists. I was surprised to see it on the former. And what's with "Freddie"? Wasn't the Sussexes naming their son "Archie" bad enough?