One and Done Syllable Girls

Nell, once a nickname for Helen, Ellen, or Eleanor, is a sweet old-fashioned charmer that is fashionably used today in its own right. While Nell is perfectly in tune with contemporary vintage name style, it hasn't taken off the way some of its sisters have and so maintains an air of distinction. Use Nell or Nellie as a short for any name from Eleanor to Penelope or just name her Nell.

Pearl, like Ruby, has begun to be polished up for a new generation of fashionable children after a century of jewelry box storage. The birthstone for the month of June, Pearl could also make a fresher middle name alternative to the overused Rose. Cool couple Maya Rudolph and Paul Thomas Anderson named their daughter Pearl Minnie, followed by Jack Osbourne, and several celebs have put it in the middle spot, as in Busy Philipps's Cricket Pearl, Jake Owen's Olive Pearl and Caleb Followill's Dixie Pearl .

The sassy, steel magnolia appeal of Oscar-winning Reese (born Laura Jeanne—Reese is her mother's maiden name) Witherspoon has single-handedly propelled this formerly boys’ name into girls' popularity.

Rue has gone from Golden Girls actress to Hunger Games heroine. This botanical name is also a coincidental double word name, meaning "regret" in English and "street in" French. Despite these unfortunate secondary meanings, Rue has real potential to be one of the most popular new middle names for girls.

The short but solid Irish surname Shea works for both genders; Kevin James has a daughter named Shea. Shay is another possible spelling.