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.

Lyra is a name with ancient and celestial roots that's found new popularity thanks to its starring role in Philip Pullman's book series, His Dark Materials and its subsequent movie and TV adaptions. Simple yet starry, Lyra is familiar but not overused in the US, where it ranks in the Top 500.

Like the French author with whom the name is most closely associated, Colette is a chic and charming name, sharp, stylish, and feminine but without the frills of Nicolette. After disappearing from the charts for 30 years, Colette rejoined the US Top 1000 back in 2012 and is still on the rise.

Mila is a popular name that took a 125 year nap, ranking in the Top 1000 in 1881 and then not ranking again until 2006, after actress Mila Kunis appeared on That 70s Show.

Hayden – a formerly obscure name that's risen to huge popularity – has dipped in this year's ratings. Though Hayden is among the most distinctive of the bunch, it gets lost in the crowd of Jaidens, Bradens, Aidans, and endless variations. Associated with Hayden Christensen, of Star Wars fame.

As modern as it sounds, Blaise is an ancient Christian martyr name. In Arthurian legend, Blaise is the name of Merlin the Magician's secretary. Its relation to the word and name Blaze gives it a fiery feel. Amanda Beard named her baby boy Blaise Ray.

Newly fashioned but familiar and with an on-trend, unisex feel, Addison seems like the perfect solution for anyone who can't decide between Madison, Adeline, and Alison.

A multicultural name, that's currently on style and fits right in with Kaia, Maya, Raya, and Mia. Currently in the Top 500 in both the UK and The Netherlands, it has several different origins and meanings.

Senna is a flowering bush common in the tropics, with bright yellow flowers. In herbal medicine, Senna has gained some notice as the active ingredient in so-called "dieter's teas," which works mainly as a laxative. While that is a less-than-savory association, Senna has a pretty sound and is a fresh entry in the flourishing botanical names genus.

Sawyer is one of the top unisex names, used for their daughters by such parents as Sara Gilbert, co-host of The Talk and former actress on Roseanne, currently on The Conners.

The capital of England makes a solid and attractive twenty-first-century choice in the US where it is currently in the Top 1000. Given to nearly 1000 girls and 200 boys each year, it is a unisex option that has been in slow decline since its peak in 2013. Conjuring up images of Big Ben, red phone boxes, and the London Eye for some, but perhaps the rush hour commute and grey skies for others, London is far less popular in the UK and other English-speaking countries.

French favorite gaining notice here thanks to the charming film of that name. Although to the English-speaking ear it sounds more like Emily than Amelia, it derives from the latter which has a different origin and meaning.

A male Biblical name meaning healer, Asa is also an international gem. In Japanese, it means "(born in the) morning". And in Scandinavia, where it's generally spelled Åsa or Ása and pronounced O-sa, it's a popular diminutive form of Old Norse names beginning with the element áss "god".

Joel is one of those boys’ names that's never been super-popular yet has never been UNpopular either -- it's been in the Top 400 in the US since we started keeping statistics in 1880. So it's inevitable that its female form Joelle would gain visibility too, and indeed Joelle was used most widely during Joel's reign in the Top 100, from the late 1960s through the early 1990s.

The obscure yet not unappealing name of a legendary heroine of Rome, likely derived from the Roman family name, Cloelius. It is believed to come from the Latin word cluere, meaning "to have renowned fame".

An old name, with a history separate from Emily and Emma and a different kind of vintage feel, that's a possible alternative to top-of-the-pops names. More common spelling is Emmeline.

While Haidee may sound like a variant of Heidi or Hailey, it's actually a separate name with a literary history. First appearing in Byron's epic poem Don Juan (1819), it was likely inspired by the Greek word aidoios meaning "modest, reserved".

This is a rare and lovely form of Susannah commonly heard in Israel. Shoshana Shapiro — nicknamed Shosh — is the character played by Zosia Mamet on the hit HBO series Girls — a fact that could give the name an upward thrust.

Hot star Ashton Kutcher is pushing this unisex choice toward the boys' camp, but its variation Ashtyn is on the rise.

As a diminutive name, Riza is used predominantly in the Philippines, though it also has its roots in Hungarian, and in Arabic. Spirited yet familiar, Riza could be related to the surname Rizal meaning "rice field", to the names Tereza and Clarissa, or to the Arabic masculine name Rida, meaning "contentment".