This link is to a story about the popularity of certain baby names that come from celebrities.
Once at a talk on Mary, the speaker said we'll know that Marian devotion is really on the upswing when people start naming their girls "Mary" again. I checked the list of the 50 most popular names from 2004, and "Maria" is number 45.
Although this isn't a scientific study, the popularity of celebrity names as opposed to saints' names does give a sort of rough idea of where popular culture is trending. One interesting note is that the name John Paul jumped from 888 in 1978 to 647 in 1979 (Pope John Paul was elected in October, 1978).