Arlette is a French form of the Germanic name Herleva, which was the name of the mother of William the Conqueror. It peaked in France in the mid-1930s, but you might be surprised to learn that in the US, it's only just beginning to catch on now. It entered the US Top 1000 for the first time in 2018, and has dipped in and out in the years since then.

Arlette

Avalon, an island paradise of Celtic myth and Arthurian legend--it was where King Arthur was taken to recover from his wounds-- and also the colorful capital of the California island of Catalina-- makes a heavenly first name. Actress Rena Sofer and British musician Julian Cope used it for their daughters.
 Avalon manages to blend the appeal of Ava and Evelyn, while sounding more interesting and unique.

Avalon

A nickname for Bella or Isabella, from Isabelita.

Belita

Bellamy is emerging as an up-and-coming <a href="https://nameberry.com/girls-names">girls' name</a>, an Irish surname-y riff on the super-popular Bella series of names. While the Bella connection makes Bellamy sound a little trendier and more popular than it really is, we see the name possibly rising through the ranks for both genders in the coming years.

Bellamy

Beyla

Briet

Cassia is related to the cassia tree, which has yellow flowers and produces a spice that can be a substitute for cinnamon. Keziah, the name of Job’s daughter in the Old Testament, derives from the name of the plant as well. Cassia also has ties to the Ancient Roman name Cassius, an Ancient Roman family name meaning "hollow." 
 
Cassia is one of the rare names that's truly unusual yet has a stylish feel. Cassia has the added attraction of the sweet smell of cinnamon, thanks to its botanical associations. We predict Cassia will become much more popular along with her brother names Cassian and Cassius. 
 
Keziah, the Biblical equivalent, is also due for rediscovery, while Kassia is the Greek spelling that ties the name to Saint Kassiani, a feminist heroine.

Cassia

Clover is a charming, perky choice if you want to move beyond hothouse blooms like Rose and Lily, and it's recently become a new celeb favorite, chosen by both Neal McDonough and Natasha Gregson Wagner, who used it to honor her mother, Natalie Wood, one of whose most iconic films was Inside Daisy Clover. 
 Clover also has a long association with good luck, via the four-leaf clover, and through the shamrock symbol of Ireland. It first came to wide notice via a couple of soap opera characters.
 In the movie The Good Shepherd , Angelina Jolie's character is called Clover--but her birth name was actually Margaret.

Clover

Like the French author with whom the name is most closely associated, Colette is a chic and charming name that is being rediscovered. After disappearing for nearly 30 years, Colette rejoined the Top 1000 in 2012 at Number 659 and has continued to rise since then. Dylan McDermott used it for his daughter, as did actress Constance Zimmer.
 There is an appealing animated Colette featured in the film Ratatouille.

Colette

Fresh, bright, and sunny, Della could be an alternative to Ella, Delilah, or Adeline. Familiar but not yet overused, it combines the elements of contemporary favorites with vintage charm.
 
With its noble meaning and associations with delight, Della was a popular choice in the 19th century and remained so up until the 1930s, when it slowly began to fall out of favor. It disappeared from the Top 1000 in 1978, but, after an absence of 40 years, it re-entered the charts in 2018.
 
This reappearance was perhaps partly inspired by actress and singer Della Reese, who died in 2017. This could have brought the name to the attention of a new generation of parents, and it has been climbing the US charts ever since. 
 
As a diminutive of Adela or Adelaide (or perhaps Delphine, Madeline, or Idella), Della fits into the trend of nicknames as proper names, blending well with the likes of Mila, Josie, and Nora.
 
As of 2023, it is given to around 450 girls in the US each year and may well be one to watch out for. A small caution, however, is that della does mean "from the" in Italian.

Della

Eliora is a melodic name ripe with vowel sounds. 

Eliora

Eviana

Halona

The lilting name of a range of mythical mountains, with an extensive menu of spellings, and a more unusual way of fitting in with current favorites Lila and Lola. 

Kalila

Kimia

Kalia

Lynae

The French Miley?  This trendy choice from Brittany, which is pronounced either as Miley or May-lee, is related to the traditional (male) saint's name Mael, traditionally feminized as Maelle.

Maelie

Like Penn Jillette, you can have your own little brash babe. 

Moxie

Most contemporary parents would probably opt for the more streamlined Elle. 

Roselle

Sedrina

itskitty's list "*Undiscovered Girls Names*" of 21 great name ideas: Arlette - Sedrina!

*Undiscovered Girls Names*

Great baby names that need to be discovered!