Rare girl names from A-Z

Simple plus unusual is a winning combination.

Cassiopeia, the name of a mythological mother who became a stellar constellation, is challenging but intriguing, and has all those softening Cass nicknames available. And with all names Cass-related trending, Cassiopeia may be an unusual route to a stylish name.

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.

A name with several distinguished namesakes: the wife of ancient Roman Emperor Marcus Aurelius, a famous Italian opera singer, and two Catholic saints--making it both substantial and unusual.

This name was given to Aisha by Muhammed because of her characteristically rosy cheeks. Humaira is the common Urdu spelling of this name, which can also be written as Humayra. The name ranks in the UK Top 1000 and has done since at least the 90s.

Iolanthe is known primarily through the 1882 Gilbert & Sullivan operetta of that name, in which the title character is a fairy. Iolanthe is a softer version of Yolanda, and is the kind of multi-syllabic classical name once considered too weighty for a modern baby girl, but now within the realm of possibility--this one as a dramatic twist on Violet. The biggest drawback is its variety of legitimate pronunciations in English.

Khaleesi is an invented name introduced to the world by inventive and prolific author George R. R. Martin for his wildly popular Game of Thrones series—it's Dothraki for "queen" and is one of the titles of the character Daenerys. It entered the US Top 1000 in 2014.

Mignonette is kind of a diminutive of a diminutive. Mignon is the French word for cute, so Mignonette is more or less cutie.

Ottilie is trending in the UK, where the pronounced T helps the name sound pretty and delicate, rather like Amelie and Elodie. Ottilie is less popular in the US, where many Americans pronounce it as a near-homonym for "oddly".

Philomena is an earthy Greek name now used in various Latin countries. While it has felt simply clunky for many years, it's starting -- along with such sister names as Wilhelmina and Frederica -- to sound so clunky it's cool.

A rare and lovely Nahuatl name, which literally means "quetzal feather" – a quetzal is a beautiful green bird native to Mexico, Guatemala and South America. The word is figuratively used to refer to something precious or beautiful, making this a lovely option for a wished-for baby girl.

Invented by author Stephenie Meyer for the Twilight series for the half-human, half-vampire daughter of Edward Cullen and Bella Swan, it's an amalgamtion of the names of Bella's mother Renee and Edward's adoptive mother Esme. Much to our surprise, some people are trying this at home.

The name of one of the Furies in Greek mythology, a goddess who avenged crimes of murder. She is described as wearing a dripping blood-red robe, with a serpent coiled around her waist.

U is an oft-rejected first initial, but a name like Uzoma makes it cool.

Vasilisa is the feminine form of Vasili, the Russian translation of Basil.

Waverly, with its literary resonance and lilting three-syllable sound, could well become the next generation's successor to Kimberly. Its upper-crusty surname feel places it among the new stylish English names for girls, successors to Ashley and Whitney.

Xhelile may be the Albanian variation of Jalila — an Arabic name meaning "illustrious."

This French name has the elegance of other '-ette' names such as Colette and is a botanical name without being too obvious about it.

With historical roots as a beautiful and intelligent ancient queen and literary ties to Hawthorne and Edith Wharton novels, this rarity could appeal to adventurous parents seeking the romantically unusual. Tina Fey used it as her daughter Alice's middle name.