The Baby Name Wizard, at babynamewizard.com/voyager graphically shows how names have changed. It looks like most of the "biblical"/Gospel names (Matthew, Mark, Luke, John) all peaked in the 70s.
The main point is that the number of different names has increased - and the top names are a much smaller percentage of the total babies named.
Another fun point, is seeing the fast relative rise of less well established/previously conventional names. A rise in names starting with Q, and Y for example.
For example, Tom seems to be now less popular than Tomass. So there are more crazy cats being named than Toms...