This friendly Irish surname is catching on with girls, perhaps due to the easy Callie nickname.

Boys' favorite retains more of its poetic, windswept quality when used for a girl, as Robin Wright and Sean Penn did. Alyssa Milano gave her daughter Elizabella Dylan as a middle name.

Although the Kathryn spelling feels like a modern streamlining of this ancient royal and saints' name, it is in fact found back through history. At least one of Henry the Eighth's unfortunately wives sometimes spelled her name as Kathryn.

Bryn is an up-and-coming gentle, yet substantial, Welsh name that would also be effective in the middle spot. In Wales it's a traditional boys' name, but it's far more popular for girls now in the US.

Lynn arrived in the 1940s, spinning off from the wildly popular Linda, to become a top midcentury middle name. Now, Lynn's in limbo.

Originally used for children baptized in holy water from the river Jordan, it became one of the leading androgynous names of the nineties. As the balance tips toward the boys' side, it's slipping on the girls' popularity chart. Alternate spelling Jordyn is now more popular for girls.

Bird name Raven, once a symbol of pride for both African-American and Wiccan parents, is finding new life as a superhero name. Raven Darkholme is the real name of Mystique, heroine of the X-Men films played by Jennifer Lawrence. And there is another Raven superheroine in Teen Titans. Some parents may still choose Raven to signal black pride or mystical powers or maybe even Edgar Allan Poe fandom, but we are guessing most inspiration is coming from the comics.

Anwen is one of the simplest and best of the classic Welsh girls' names, more unusual than Bronwen but with the same serene feel.

The increasingly popular Irish boys' name Declan is crossing into the girls' column now as well, used for over 50 baby girls in the US last year.

Used far more for boys with this spelling, but still has a nice impish Irish feel for a girl.

One of those names that's suddenly on the map because of a celebrity's influence, Leighton Meester of the TV show Gossip Girl. She pronounces it LAY-ton but some will intuitively say LEE-ton.

Peyton is a unisex surname that rose to fame in the 90s, with parents drawing inspiration from football star, Peyton Manning, and, oddly enough, from "Peyton Flanders", the villainess of the 1992 film, The Hand That Rocks The Cradle. Combining gentle sounds with contemporary style and the naughtiness of Peyton Place, the name remains a popular choice in the US today.

Rowan has been shooting up the charts on both the boys' and the girls' side, carrying the appeals of a trendy "o" vowel, a soft sound, and a nature connection to top it off. The modern variation Rowyn has followed in its footsteps and while the traditional spelling is used five times more often, Rowyn is still given to around 350 girls each year.

Endellion is the name of an early saint who was a daughter of King Brychan and goddaughter of King Arthur whose life is commemorated by the Cornish village of St. Endellion. This intriguing ancient name was brought into modern usage by British Prime Minister David Cameron, who used it as one of the middle names for his fourth child, a baby girl.

Kristen may be somewhat past its fashion high point, but it remains forever crystalline clear. Possible problem: confusion with the similar Scandinavian names Kristin, Kirsten, Kirstie, et al.

The popular Irish name Muireann comes from a mythical mermaid who was tranformed into a woman by a saint. Pronunciation is like the surname of the actress Helen Mirren, but with the spin of a w sound after the initial M.

The phonetic Carolyn spelling, which was very popular from the 1920s to the '60s, has been steadily on the wane while Caroline herself has stayed strong.

St. Merryn, the name of a Cornish town derived from Mirin, a 6th century Irish saint important in Scottish history often as Mirren, is sometimes used in modern times as a girl's name. Lovely, sleek, shimmery feel though many will assume it's invented until you enlighten them on its long history. Also spelled Meryn.

This once obscure name was propelled to fame by Britney Spears, and by Will and Jada Pinkett Smith in the 2000's. It skyrocketed into the US Top 10 for boys, but it also saw significant use for girls.

Adrian is an ancient gender-neutral name off its peak for girls but increasing in popularity for boys throughout Europe. The most popular female form in the US is Adriana, followed by Adrianna, then the French Adrienne, and finally the unisex Adrian.