Although she declared her independence as far back as the reign of Elizabeth I--Good Queen Bess, Bess now sounds less passé than Beth or Betsy. 

Bess

Bijou is a name that lives up to its definition -- a real jewel. Warning: not unheard of on poodles' dog collars. Actress Bijou Phillips is its best known bearer. It can also be spelled Bijoux.

Bijou

Much more manageable than the full form of the name. Possible international alternative to Ella.

Elka

Emilienne

Eugenie enjoyed a major dusting off when Fergie and Prince Andrew chose it for their daughter, restoring a patina of royal sheen it hadn't had since the time of Napoleon III's glamorous empress--who spent much of her life in England. It was also borne by Princess Victoria Eugenie of Battenberg, a granddaughter of Queen Victoria, after whom Prince Andrew's younger daughter was named.
 Eugenie is the title character of a Balzac novel, Eugenie Grandet and also the full name of Scarlet and Rhett's daughter, nicknamed Bonnie Blue because of the color of her eyes, in Gone With the Wind.
 The elegant Eugenie is pronounced differently in different countries. The princess says YOO-zjen-ee while the French pronunciation is more like oo-ZJAY-nee and the Germans say oy-GAIN-ee-ah.

Eugenie

Of all the botanicals, Fern has been one of the slowest to move back from the front parlor into the nursery, despite the appealing girl character in the children's classic Charlotte's Web. Fern was most popular from the turn of the last century through the 1940s, reaching a high of #152 in 1916. We can certainly see her rejoining the long list of popular greenery names.
 
Reality TV stars Jessa Duggar and Ben Seewald recently named a daughter Fern, which could easily give it a boost.

Fern

Grainne is the Irish form of the name often Anglicized as Grania. It was the name of the ancient grain goddess and also of the fiancee of mythological hero Finn McCool and lover of Dermot, who was a heroine of the seas. 

In the past, the name was anglicized as Grace, as in Grace O'Malley, Ireland's pirate queen. Grania is a phonetic spelling.

Grainne

This color name, spelled either Gray or Grey is rapidly catching on. Actress Jenny von Oy recently called her daughter Gray Audrey.


Gray

Free and fun name if you don't want to be pinned down to Noelle, Pasqua, or Valentine. 

Holiday

June, a sweetly old-fashioned month name derived from the goddess Juno, was long locked in a time capsule with June Allyson (born Ella) and June Cleaver, but is rising again especially as a middle name. 
 June was a Top 100 name from 1915 to 1941, peaking in 1925 at Number 39. It fell off the U.S. Top 1000 in 1987 and returned in 2008 after a two-decade hiatus. Now, we'd call it one of the vintage girls' names starting with J due for a comeback. Balthazar Getty has a daughter named June and Amanda Peet used it as her daughter Molly's middle name.
 Juni is the Scandinavian version; other related choices are Junia, Juno, Juna and Djuna.

June

The whimsical quality of the work of Swiss artist Paul Klee is somehow reflected in his name, although many would mispronounce it to rhyme with key.  Say it like clay. 

Klee

This body of water runs deep; the best of a group of new possibilities that includes Bay, Ocean, River, and the more established Brook. It has received attention via the actress Lake Bell. Lake would make a particularly cool and refreshing middle name, as Gisele Bundchen and Tom Brady did for daughter Vivian.
 Lake is also a fairly common surname, represented by 1940's blonde femme fatale Veronica (born Constance Ockelman), actress/talk show host Ricki and Emerson, Lake & Palmer bassist Greg.

Lake

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

This feminine form of Mael has the distinctive "aelle" ending found in Brittany. In the French spelling Maëlle, it is a Top 100 girls' name in France.

Maelle

Maisie, a charming name long popular as a nickname for Margaret or Mary, entered the Top 1000 as itself ten years ago and continues to rise. Game of Thrones star Maisie Williams helped propel the name back into the limelight, along with the that of her character, Arya.

In literature, Maisie is the name of the precocious young title character in the Henry James novel What Maisie Knew, and is also the main female character in Rudyard Kipling's The Light That Failed. And to bring things up to date, Maisie is a half-blood character in the Harry Potter series. Spelled Maisy, it's a popular children's book series.
 When Maisie re-entered the US Top 1000 in 2014 at 658, it was one of the fastest rising names of that year. She's still got a ways to go In the US to catch up to other English-speaking countries, where Maisie ranks in the Top 100.

Maisie

Merielle

Millie is back. It's a Top 100 name throughout much of the English-speaking world, though not yet in the US. Millicent would be an appealing long form, but many people are using Millie all by its cute self -- so many, in fact, that it returned to the Top 500 in 2015 for the first time since World War 2 and continues to climb.
Millie is a winner with parents who like their girl names offbeat, frilly, and old-fashioned. Millie is one of the coolest <a href="https://nameberry.com/search/girls-names/m">girl names starting with M</a>.
 Millie was in the Top 1000 here until 1966, peaking at Number 128 way back in 1881; it made its return appearance in 2009. The name got a lot of attention via the 1967 film Thoroughly Modern Millie, set in the 1920s, but today is more closely identified with the riveting young British actress Millie Bobby Brown who plays Eleven in the television show Stranger Things.
 Fashionable relative: Milla or Mila. Milly is also sometimes used. Tillie is another old-school nickname that, like Millie, sounds modern again.

Millie

Though greatly overshadowed by the trendy Olivia, Olive has a quiet, subtle appeal of its own -- and is now enjoying a remarkable comeback. Olive is one of only four <a href="https://nameberry.com/search/girls-names/o">girl names starting with O</a> on the US Top 1000. Cool couple Isla Fisher and Sacha Baron Cohen chose it for their daughter, reviving the name to stylishness, and now Drew Barrymore has a little Olive too, as has country singer Jake Owen. 
Olive has positive associations to the olive branch as a symbol of peace and the ancient olive wreath that celebrated success.
 Olive was the name of the adorable Abigail Breslin character in the popular movie Little Miss Sunshine. Olive Chancellor is a major character in Henry James's The Bostonians and Olive Kitteridge is a Pulitzer Prize-winning Elizabeth Strout novel that was adapted into a TV miniseries in 2014. Kids might be familiar with Olive the Other Reindeer.
 Olive came into fashion at the end of the nineteenth century along with other botanical names, when it had a run in the Top 100.

Olive

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".
 
Sweet but stylish, Ottilie was once reserved for the British upper crust, to be spotted among The Telegraph name rankings, rather than in your average school class. However, it has been quickly climbing the charts since 2015, and in 2022, it debuted in the UK Top 100.
 
Rarely seen in the US since the 1880s, Ottilie does have a few cultural references: She is a key character in Goethe's Elective Affinities, Robert Louis Stevenson wrote a poem called To Ottilie, Franz Kafka had a sister named Ottilie, and it is the name of the protagonist in the John Wyndham sci-fi story Random Quest.
 
Probably the best-known Ottilie is the German journalist, abolitionist, and feminist Ottilie Assing, who had a long involvement with fellow abolitionist Frederic Douglass. Others include the Irish Jazz singer, Ottilie Patterson, and Ottilie Rue Sugg, daughter of British influencers, Zoe Sugg and Alfie Deyes. 
 
Popular among Nameberry users, Ottilie is both vintage and playful, with the sweet nickname options of Lottie, Tillie, Otto, and Otter.
 
If the popularity of Ottilie puts you off, or it doesn't sound right in your accent, you could try a variant, such as Ottoline, Ottilia, and Odile, or names with similar sounds and style, such as Odessa, Odette, Romilly, or Coralie.

Ottilie

Parents are beginning to scan the whole spice shelf for inspiration, picking up on Saffron, Sage, and Cinnamon -- and opening up a chance for this spiciest possibility of all; used for peppy TV characters. 

Pepper

This name of a tragic figure in Greek mythology, the daughter of King Minos, sister of Ariadne and wife of Theseus, has a mysterious and intriguing appeal, and would make a dramatic choice.

 Phaedra has been a persistent theme in literature, both ancient and modern. There have been plays by Euripedes, Racine, Unamuno, and O'Neill, novels, poetry, operas and film--as recently as the 2011 Immortals starring Freida Pinto.
 One celebrity pulled a gender switch when she named her son Phaedra Bloom Forever.

Phaedra

British-born novelist Plum Sykes has taken this rich, fruity name out of the produce section and put it into the baby name basket. It's more appealing than Apple, more presentable than Peaches. The French equivalent, Prune, is very fashionable there but would not fly with English speakers.
 Plum Sykes was born Victoria, and her nickname derived from the variety of fruit called the Victoria Plum.
 Plum makes an appealing middle name choice--Moon Unit Zappa used it as such for her daughter Matilda. The color of the fruit makes it one of the appropriately amethyst-hued <a href="https://nameberry.com//list/614/names-for-aquarius-babies">names for Aquarius babies</a>.

Plum

Poppy, unlike most floral names which are sweet and feminine, has a lot of spunk. Long popular throughout the rest of the English-speaking world, Poppy is finally starting to rise toward the top in the US, where it entered the Top 1000 for the first time in 2016.

 British TV chef Jamie Oliver used the name for his eldest daughter, Poppy Honey Rosie, as did Anthony Edwards, Jessica Capshaw, and Anna Paquin and Stephen Moyer. A notable adult Poppy is Australian Without a Trace star Poppy Montgomery (full name Poppy Petal Emma Elizabeth – she and her sisters are all named after flowers: Lily, Daisy, Marigold and Rosie).

 Due to the flower's bold crimson color, Poppy makes an especially good choice for a redhead. In the UK, it is a traditional <a href="https://nameberry.com/list/605/names-for-november-babies">name for November babies</a>, due to the flower's association with Remembrance Day (Nov 11), honoring the memory of members of the Armed Forces who have died in the line of duty.

 Other Poppy-like names to consider: Pippa, Piper, Posey and Petal.

Poppy

Roux, a color name meaning russet or reddish brown, is a possible middle name for your little auburn-haired babe, though a post-Hunger Games child would more likely be called Rue. Roux is also a culinary term for a mixture of fat and flour used in French cooking to make sauces.

Roux

Roux is the name of the dashing Johnny Depp character in Chocolat. Roux is French from a Latin word meaning russet or brownish red; it's also a cooking term for a mixture of flour and butter that forms the foundation of many gravies or sauces. Most of today's children with this name, pronounced roo, will actually spell it Rue, for the female character in The Hunger Games.

Willa has become increasingly fashionable, with its combination of Willa (born Wilella) Cather-like pioneer strength and the graceful beauty of the willow tree. 
Sophie Turner and Joe Jonas are the latest celebrities to welcome a daughter named Willa. Other stars who used this name include actress Keri Russell, who named her daughter Willa Lou and the late actor Philip Seymour Hoffman, who used Willa for the youngest of his three children. David Mamet and Brian De Palma also have daughters named Willa, plus it's the middle name of Meryl Streep's actress daughter Mary (called Mamie.) Young Willa characters have appears on Six Feet Under and True Blood.
 Willa originated as a short form of Wilhelmina. After a half-century hiatus, it reentered the U.S. Top 1000 in 2010 and soared to the Top 500, for the first time since 1949, in 2015. Willa might also work as an honor name for an ancestral William.

Willa

Yael is an Old Testament name often heard in Israel that could work well here: just remember that it's pronounced with two syllables...it is also spelled Ya'el. In the Bible she was a Kenite woman in the time of Deborah who killed the enemy general, Sisera.


Yael

roseythelimited's list "Great Middle Names for Girls" of 27 great name ideas: Bess - Yael!