I just figured out that it shows a random one when you don't enter a query, that's cool.
Other spikes: Linda, Jordan, Mason, Deborah, Beth, Paige, Laurie, Chloe, Megan, Stella, Stacey, Kim
It seems like female names are much more likely to have sharp spikes in popularity verses male first names.
The other names show similar shapes:
Meg: http://rhiever.github.io/name-age-calculator/index.html?Gend...
Jo: http://rhiever.github.io/name-age-calculator/index.html?Gend...
Beth: http://rhiever.github.io/name-age-calculator/index.html?Gend...
The second bump for Meg could be due to Meg Ryan?
My wife dug in her heels pretty early in the pregnancy for a name that I later learned was a character on a TV show. Judging by the site, she's not the only one. The peak is still under a hundred, so not as embarrassing as, say, characters from 90210.
Names (just like everything else) have fads. Fads come and go.