It might also be a socioeconomic thing. My name, with my spelling, actually peaked in the '60s - but then there was a trendy variation in the '80s that tended to cluster along with names like Desiree, Destiny, Star, Brandy, Kayla, etc., which I also don't see much of any more in my current circles.

Have you seen this animated map of the spread of #1 girls' names state by state? http://jezebel.com/map-sixty-years-of-the-most-popular-names-for-girls-s-1443501909