Baby names travel in packs. Once one cool girl name gets popular, similar ones tend to follow. These names often share sounds, but they can also be connected by a theme such as city names, bird names, or virtue names.
Certain name groups can become emblematic of entire generations. Girls with names ending in -ney (think Courtney, Whitney, Sydney) are easily tagged as Millennials. The generation currently being born will be identifiable by their Ev- and -lani names, as well as their royal word names.
These are some of the cool girl name groups currently on the rise. Each individual name varies in popularity, but as a bunch they are trending among girl names.