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?