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.

Isa is a name unto itself as both a Persian name meaning "strong-willed" and as Germanic one derived from the element is meaning "ice". It can also be a short form of Isabel, Isabella, Isadora, Louisa, and similar. Currently popular in Brazil and The Netherlands, it has seen some increased use in the US in recent years, perhaps owing to the popularity of other short names like Ava, Mia, and Isla.

Sister of Antigone and daughter of Oedipus in Greek mythology, Ismene's name is unlikely to make it in modern times because of its teasability factor. Ismay or Esme would be better bets.

This French form of the name Ismeria is one of those uncommon names that's been consistently used in France since the middle ages.The origins of this rare name are shrouded in mystery. Ismeria / Ismérie is an obscure figure in European Christian legend, sometimes purported to be the great-aunt of Jesus Christ, who is connected to the devotion of the Black Madonna.

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.

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".

The rise of the the various Isabel names may give a boost to this variation, which has a sunny, springtime feel.

The mother goddess Ishtar (also called, or identified with, Ashtoreth, Ashtoret, Astarte and Inanna) was worshipped by the Assyrians and Babylonians as the goddess of love, war, justice and fertility. While the original meaning is unknown, the name possibly derives from "Attar" meaning the morning star. She has been equated with the Greek Aphrodite.

A name that seems to be a combination of Isabel and Susannah, used in the United States in the 18th and 19th centuries, most notably for a daughter of Paul Revere. Isannah was also a character in the 1943 Revolutionary War novel Johnny Tremain. An unusual old choice with modern possibilities.