Surname style Whitley emerged in the late 1980s as a spin on the (then) mega-popular Whitney, rising dramatically from obscurity to the Top 500 after it featured on a character in the TV sitcom, A Different World. By the mid-90s, it was out of style, but the recent appeal of retro names has saw it return to the US charts in 2018.

Abbreviated form of Harley that might also be spelled, for girls, Arleigh or Arlee.

This phonetic spelling of a traditional Scottish male name wasn't seen until used by Vince Vaughn for his daughter. As Lachlan becomes more of an established boy's name in the US, more parents are turning to the Locklyn spelling on the girl's side.

This is one surname-name that may swing decidedly to the male side, thanks to highly-visible young actor Alden Ehrenreich.

Jan, not short for Janet or Janice but standing on its own, ranked in the Top 200 throughout the 1950s but dropped off the Top 1000 in the 1980s and now is a truly extinct name, given to fewer than five baby girls in the US each year.

Rey, a Ray-soundalike that has ranked on the boys' side for the past 15 years, is about to get more popular for girls too, now that it's the name of the new heroine of the latest Star Wars movie. While the sound of the name is nothing new, the royal connection is, joining names such as Reign (Kardashian) and Charlotte (the new Princess) in an expansive definition of royal baby names.