Top choices for "Baby Sister"

Adeline has a lovely, old-fashioned "Sweet Adeline" charm, but has become so popular in the US under so many spellings and variations -- with Adalynn and Adalyn also popular -- that considered together it is far more popular than it first seems. Adorable nickname Addie is also pervasive.

This combination of names Aubrey and Brielle follows a ton of current name trends, so it's no surprise it has been on the rise since joining the US Top 1000 in 2012. We think this is a good option for parents wanting to use Aubrey while also desiring a definitively feminine name.

Audrey is one of the girls' names that have been rising due to their connection to Old Hollywood glamour—in this case the eternally chic and radiant Audrey Hepburn. Audrey has another very different appeal as one of the elite group of girl names that mean strong, brave, or powerful.

Sabrina, the bewitchingly radiant name of a legendary Celtic goddess, is best known as the heroine of the eponymous film, originally played by Audrey Hepburn, and later as a teenage TV witch; it would make a distinctive alternative to the ultrapopular Samantha. Similar names you might also want to consider include Sabina and Serena.

Selena is smooth, shiny, and sensual, a nineteenth-century name that found new life in the Latino community, following the biopic of slain Tejano singer Selena Quintanilla, starring Jennifer Lopez. But you don't have to be Latin to love Selena, which is both distinctive yet in step with stylish modern names such as Seraphina and Celia.