Isla is a hit name throughout the English-speaking world but hasn't found the same popularity in other western countries, perhaps because its spelling and pronunciation don't make sense for those whose native language is not English. Think island without the final two letters.

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.

Olivia, a lovely Shakespearean name with an admirable balance of strength and femininity, is the Number 1 name for baby girls in the US and one of the top girls' names around the world.

Violet is soft and sweet, yet with a vivacious edge. Today, Violet is the top flower name for girls, outranking Lily and Iris in the Top 100, and the second most popular color name for girls after Scarlett.

The quirky, offbeat and energetic botanical name Ivy is enjoying a deserved revival, propelled even higher by its choice by high-profile parents Beyonce and Jay-Z for daughter Blue Ivy. Ivy is also traditionally used at Christmas, make this one of the perfect names for December babies.

Sophie is the French form of the Greek Sophia, for which it is also commonly used as a nickname. Given Sophia's long standing among the Top 10 girl names in the US, Sophie may feel more popular than it actually is.

Lily is the most popular of the popular delicate century-old flower names now making a return, thanks to its many irresistible attributes: a cool elegance and a lovely sound, a symbol of purity and innocence, and a role in Christian imagery.

Melodic and lively, Delilah has cut itself (mostly) free from its treacherous past to become a contemporary favorite.

Natalie — a Franco-Russian name — became Americanized years ago and is one of those surprising names that's always ranked among the girls' Top 1000 names in the US.

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.

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.

Originally inspired as by eighties TV actress Mackenzie Phillips, parents since have flocked to Mackenzie for their daughters. Now a staple All-American choice, Mackenzie has ranked in the US Top 1000 for nearly 50 years.

Mackenzie originates from the Scottish surname which itself an anglicized form of the Gaelic Mac Coinnich. Coinnich is one of the original Gaelic forms of Kenneth meaning "handsome, beautiful, comely".

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.

Like Peggy and Patsy, Penny is a peppy vintage nickname that fell out of favor (and the Top 1000) for a while, but has recently rebounded by reentering the charts in 2013. Expect it to continue gaining traction on the heels of Penelope.

Bright, spirited, and playful, Nyla shares sounds with the popular Isla, Lila, Layla, and Delilah, making it feel fresh and in style. A name with a number of possible origins, it made a brief, anomalous appearance on the US charts in 1941, before disappearing again for the next 60 years. It has been back in the US Top 1000 since 2001, and is currently on the rise, given to around 1230 girls each year.

The Lyla spelling variation has now superseded the original Lila — the former remains on the rise while the latter is consistently falling in popularity.

Among the Top 20 names of the 1990s, today's Courtney is more apt to be the babysitter than the baby. Courtney has dropped since its peak at Number 17 in 1995. Familiar from Courtney Love and Courtney Cox.

The e-addition takes the name from slightly hippie-ish nature name to the place name of a picturesque island off the coast of Scotland, and for baby namers it's by far the more popular spelling.

Sydney was a hot girls' name in the 1990s, but she's arguably still cool. One of the original old man names adopted for baby girls, Sydney's popularity may be down but she's not out.

Ashley was a sensation in the 1980s and 1990s; it hit Number 1 in 1991. Ashley is still pretty but more and more parents are turning to newer names like Ashlyn and Aubrey, and spellings such as Ashleigh and Ashlea. If you hear the name Ashley in a playground today, it's more likely to be the mom than the little girl.