Hemingway readers will recognize this as the name of Papa's first wife (and, eventually, actress Mariel's grandmother). But in Victorian times, Hadley and Hedley were actually more popular for boys.

Hadley, an old surname-name best known as the name of author Ernest Hemingway's "Paris Wife," only recently broke onto the scene in a big way. While Hadley has considerable appeal, spelling variations such as Hadleigh—and onward to Hadleah, Hadleah, Hadli and so on—only emphasize its trendiness. Hadleigh made its first appearance on the US Top 1000 in 2014.

Rarely heard Hayden alternative -- though, mark our words, you'll spend your life correcting everyone's pronunciation and spelling.