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.

Sleek, sharp, and soulful, Isolde is the German form of Iseult, the fabled lover of Tristan in the Arthurian romances. First appearing in the 12th-century, the name was fairly popular in the form of Iseult, Yseut, Yseult, and Ysolt, however, it wasn't until the 19th-century that this form began to catch on, after the composer Richard Wagner used it for his 1865 opera (and for his own daughter!)

With Isabel getting so popular, parents are searching for new varieties of the name, and Isabeau is one that makes a lovely French twist.

Iris has so much going for it. It's a fashionable flower name. It's a mythological name, from the Greek goddess of the rainbow. And it's a classic name, always ranking in the girls' Top 1000 but now at its highest point ever.

Imogen has long been fashionable in England and is gaining favor in the US among stylish parents. Pronounced the British way — the initial i is short as in Kim, as is the final E as in Ken — Imogen is as pretty and classy as it is distinctive.

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.

Isaac has shaved off his biblical beard and leaped into the upper echelon of popular boys' names, outrunning cousin Isaiah. A favorite of the Puritans, Isaac has never dipped below Number 400 on the US list of top boy names.

Succinct and sharp, Ira is one of the shortest Old Testament names, belonging to one of King David's thirty 'mighty warriors.' It was widely used in the US from the 1880s to the early 1930s (it was Number 57 on the Social Security list in 1881), but fell off completely in 1993, only to return in 2016. Currently, it is in the latter half of the US Top 1000, given to around 260 boys each year.

Isabelle is the French variation of Isabel, which emerged in the Middle ages as an Occitan form of Elizabeth. Medieval queens Isabella of Angoulême and Isabella of France helped popularize the name in the United Kingdom. Isobel is the Scottish version, Isabella the Italian, and Izabel is used in Brazil.

For a long time, Isadora has been overlooked in favor of Isabella, owing perhaps to its association with the tragic modern dancer, Isadora Duncan, or because parents would rather their daughter be a Bella than a Dora. Now, with Theodora back in the charts and vintage names in vogue, Isadora has been slowly gaining more attention over the last decade.

A name that crosses cultures, Idris was virtually unknown in the US before the emergence of the charismatic actor Idris Elba, first on The Wire and then for depicting Nelson Mandela. Since then, the name has grown with the actor and is a popular choice in the UK and Belgium, and a familiar one in The Netherlands, France, and the US.

Many vowel names stylish a century ago are coming back, and Ida seems like a possible, logical successor to Ada and Ava.

An undiscovered surname possibility with upscale overtones, could be enlivened with nickname Ingo.

Smooth and sleek one-syllable name, sometimes suggested for Sagittarius boys.

Ishmael is most familiar through "Call me Ishmael," the opening line spoken by the youthful narrator of Moby-Dick. Few American parents have followed that advice, though the Spanish and Arabic spelling, Ismael, ranks at Number 362. With its warm and pleasant sound, though, we could see Ishmael tagging along behind Isaiah and Isaac.

Though it was used by the Puritans in the sixteenth century, the founding of the modern Jewish state in 1948 transformed Israel from a traditional favorite into an icon of Judaism.

A trendy name in France, sometimes also spelled Ysaline, that's related to both Isabelle and Iseult. To the American ear, it freshens up Isabelle without really improving on it.

Isotta is a feminine Italian name, essentially the Italian form of Isolde or Iseult from Arthurian legend. The name derives from a Celtic origin, though its exact meaning remains disputed, with some suggesting connections to 'ice' or 'fair' in proto-Germanic languages. Isotta features prominently in the medieval romance of Tristan and Isolde, giving it literary and cultural significance. In Italy, the name gained additional recognition through connection with the luxury car manufacturer Isotta Fraschini. While never extremely common, Isotta maintains a timeless elegance with its flowing vowels and distinctive Italian character. The name conveys a sense of classical beauty, romance, and cultural sophistication for those seeking a name with European heritage.

Strong and sharp but with a pretty, poetic feel about it, Iseult appears in the world of Arthurian legend. Also written as Yseult, Ysolt, and Isolde, the name might have Germanic roots, blending is and hilt to give it the cool, wintery meaning of "ice battle".

This form of Irene feels fresher and gives the classic name a chic, international flair. It's most commonly used in Eastern Europe.