Riley—an upbeat, friendly surname name—is red hot for girls and still going strong for boys. If you haven't been spending much time around babies recently, you may be surprised to learn that Riley is the most popular girls' name starting with R and also the Number 1 Irish name for girls in the US.

Sadie started as a nickname for Sarah, but their images couldn't be more disparate. Where Sarah is serious and sweet, Sadie is full of sass and fun.

Quinn is one of the most popular Irish unisex surnames out there, a strong and attractive choice on the rise for girls but still popular for boys. A recent year saw it used for nearly 2690 girls along with 615 boys in the US, meaning its split 80:20 across the sexes.

Thea is a diminutive of names ending in -thea, including Dorothea, Althea, and Anthea. It is also the Anglicized spelling of Theia, the Titan of sight, goddess of light, and mother of the moon. She was the consort of Hyperion, and mother of Helios, Selene, and Eos.

Charlotte, the name of the young Princess of Cambridge, is the latest classic name to join Sophia, Emma, Olivia, and Isabella at the top of the popularity list. It is now among the most popular girl names in many English-speaking and European countries.

Willa has become increasingly fashionable, with its combination of Willa (born Wilella) Cather-like pioneer strength and the graceful beauty of the willow tree.

Chloe is a pretty springtime name symbolizing new growth. Though slightly off its peak in the Top 10 in 2010, Chloe still ranks in the Top 20 and is solidly a modern classic.

Eden is an attractive, serene name with obvious intimations of Paradise, one of several place names drawn from the Bible by the Puritans in the 17th century.

Evie was derived from the English Eve or the Latin Eva, which in turn come from Chawwah, a Hebrew name related to the concept of life. Evie can be used as a nickname for any name that starts with Ev-, including Eva, Evelyn, and Evangeline, but also for names such as Genevieve and Maeve. Evie is typically pronounced with a long E sound, but a short E is also valid.

A hot starbaby name – chosen by Kelly Ripa, Chris Rock, Lisa Bonet, Denise Richards and Charlie Sheen, Carnie Wilson, and Annie Lennox, and used as the nickname of Madonna's Lourdes – Lola manages to feel fun and sassy without going over the top. Be warned, though: "Whatever Lola wants, Lola gets," to quote a song from the show Damn Yankees.

Marlowe is very much in the air, with its lovely -o ending and the modern twist it offers on the likes of Margaret, Margot, Martha, and Marlene. But is it Marlowe, Marlow, or Marlo? Well, for a girl in the US at least, it's probably Marlowe, with this spelling the only one to appear in the Top 1000.

This pet form of such names as Winifred and Edwina and Gwendolyn has loads of vintage charm, a la Millie and Maisie, with a decidedly winning vibe. And it just got celebrity cred as the baby daughter of Jimmy Fallon.

Georgia is so rich, lush and luscious, it's almost irresistible. Georgia's now a rising star among the feminizations of George, helped by associations with the southern state (named for British King George II) and painter Georgia O'Keeffe, with the Ray Charles song "Georgia On My Mind" or maybe "Sweet Georgia Brown" playing in the background.

Avery is a hugely popular name in the US, especially for girls. But while nearly four times as many girls as boys are named Avery today Avery's popularity is starting to soften for girls while it continues to strengthen for boys.

Ellie first took off in the UK—yes, in this nickname form—and this warm and friendly name has also become hugely popular here. In 2011, Ellie entered the US Top 100 girl names for the first time and has remained near the top of the charts ever since.

You might think of Harper as the hottest name of the last decade, jumping from obscurity to the Top 10, where it remained until last year.

A favorite in England and Wales where nicknames as given names are very much the norm, Tilly has the potential to catch on in the US, given its similarity to the popular Lily and Ellie and the rising stars Millie, Billie, Kallie, and Nellie.

Piper is a bright, musical name that entered the list in 1999, one year after the debut of the TV series Charmed, which featured a Piper, and it's been a consistent riser since. Piper Kerman is the memoirist whose prison experiences provided the basis for the hit Netflix series Orange is the New Black.

Josie is jaunty and friendly: among the most winning of all nickname names. She's been on the Social Security list since records began being kept.

Remi is an adorable name that's fashionable and keeps gaining momentum. Remi entered the US Top 1000 in 2013 and is now approaching the Top 100.