Adeline has a lovely, old-fashioned "Sweet Adeline" charm, but has become so popular in the US under so many spellings and variations -- with Adalynn and Adalyn also popular -- that considered together it is far more popular than it first seems. Adorable nickname Addie is also pervasive. 
Adeline originated as a French diminutive of Adele, which came from the Germanic root adal, meaning "noble." Adeline was introduced to England by the Normans in the eleventh century, was very common during the Middle Ages, then vanished until the Victorian Gothic revival. Common variants of Adeline include Adalynn, Adalyn, Adelyn, Adelynn, Adelina, and Adaline.
 Adeline was introduced to England by the Normans in the eleventh century, was very common during the Middle Ages, then vanished until the Victorian Gothic revival.
 The song "Sweet Adeline" Is an old barbershop quartet favorite. JFK's grandfather John F. Fitzgerald, mayor of Boston, made it his theme song, and Mickey Mouse serenaded Minnie with it in a 1929 cartoon.
 Pronounced ad-a-line in America, it's usually ad-a-LEEN in France.

Adeline

Agnes is the Latin variation of the name Hagne, which itself derived from the Greek word hagnos, meaning "chaste." In medieval times, St. Agnes was a very popular saint, leading to its popularity as a girl's name. Agnes Grey is the title of one of the two novels written by Anne Brontë.
 
Agnes, though it was the third most common English girls' name for four hundred years, has long been stuck in the attic. But now it looks like Agnes was so far out it's just about ready to come back in. It did look cute on a little girl in Despicable Me, and nickname Aggie has lots of retro appeal. 
 Agnes has also been making inroads in the celebrisphere—first actress Elisabeth Shue chose Agnes for her third child, and more recently Jennifer Connelly and Paul Bettany named their daughter Agnes Lark. 
 The French pronunciation—ahn-YEZ—could make it more attractive, but few Americans would comply. Other interesting variations: the Welsh Nesta, the Latin/Scandinavian Agneta, the Spanish Inez/Ines/Ynez, and the Scottish Senga—which happens to be Agnes spelled backwards.

Agnes

Anouk, made famous by French actress Anouk Aimée, is a singular name with a lovely sound and a Bohemian feel. Anouk Aimée was born as Francoise, but adopted the first name of the character she played in her debut film.
 Anouk, which is quite popular in The Netherlands, was the name of the young daughter in the French film Chocolat. (some other interesting character names in that movie are Vianne, Roux and Dedou.) The Belgian supermodel spells her name Anouck Lepére.
 Anouk is one of the most appealing of the An-starting names.

Anouk

Beatrice is back. Stored in the attic for almost a century, the lovely Beatrice with its long literary (Shakespeare, Dante) and royal history is being looked at with fresh eyes by parents seeking a classic name with character and lots of upbeat nicknames, like Bea and Bee. 
 
Beatrice has some competition with more flavorful Beatrix and Beatriz these days. Beatrice is far more popular in the UK., ranking in the Top 100, while in the US Beatrice sits in a sweet spot in the middle of the Top 1000.

Beatrice is derived from Beatrix, a Latin name meaning "she who brings happiness." In the earliest sources it is also recorded as Viatrix, meaning "voyager", so there is some weight in both meanings.
 
Beatrice was the name of Queen Victoria's youngest child. And in Dante's epic poem The Divine Comedy, Beatrice is his guide through Paradise and is idealized as the embodiment of the spirit of love. In Shakespeare's Much Ado About Nothing, Beatrice is the witty, high-spirited heroine. Other variants of the name include the French Béatrice and the Spanish and Portuguese Beatriz.
 
Nickname Bea actually stood alone on the popularity lists for four years at the beginning of the twentieth century — and it could happen again. Bea is sleek and modern, while Trixie sounds vintage and sassy — though if you favor Trixie, you may want to consider the Beatrix version of the name, which is reminiscent of watercolorist and children's author Beatrix Potter and has that surprising -x ending. Beatrice, on the other hand, feels gentler and more classic.
 
The Duke and Duchess of York, aka Fergie and Prince Andrew, thrust Beatrice back into the public eye when they chose it for their older daughter in 1988. The name can be pronounced with two syllables, BEE- or BEH-tris; with three, as in BEE- or BAY-ah-tris; or, as the Italians say it, with a magisterial four, bay-ah-TREE-chay.
 
Other names that mean happiness: Felicity and Hilary, either of which would make a good twin or sister name for Beatrice. Beatrice is also among the relatively rare <a href="https://nameberry.com/search/girls-names/b">girl names starting with B</a> that has a lot of current style value.

Beatrice

Clementine is a Nameberry favorite that broke back into the US Top 1000 in 2014 after more than half a century off the list. 
 A female variation of the more-unusual Clement, Clementine's meaning suggests peace and happiness, a lovely image. Other girls' names with similar meanings include Beatrice, Felicity, Hilary, Arcadia, Irina, and Mercy.
 If "Oh, My Darlin'" still rings too loudly in your ears, consider pronouncing Clementine as Clementeen—or even using Clementina, which rhymes with Christina. Stylish Claudia Schiffer chose Clementine for her daughter, as did Ethan Hawke and Rachel Griffiths. 
 Kate Winslet played a character named Clementine in Eternal Sunshine of the Spotless Mind. And for a kid reference—there's a Muppet named Clementine.

Clementine

Coralie is a French name not often heard here, though she's gaining some recognition via Neil Gaiman's similar sounding spooky and lovely children's book, Coraline. Other literary appearances: Coralie is the stage name of an actress in Balzac's Lost Illusions, and a French girl in an 1850 Thackeray novel.
Coralie is currently very popular in French-speaking Quebec, and there is a contemporary French singer named Coralie Clement.

Coralie

Well balanced between sleek, sweet, strong, and vintage, newly chic Eloise re-entered the US Top 1000 in 2009, following a 50 year absence. In 2022, it broke into the Top 100 in the US and across the pond in the UK. Given to nearly 3000 babies each year, Eloise is showing no sign of stepping out of the spotlight. 
 
Eloise comes from the Old French name, Héloïse, which means "healthy" and "wide." The name was first used by Héloïse, a 12th century scholar, philosopher and Catholic Abbess whose work inspired a many French and English writers.
 There is contention over whether her name is a feminized variant of Eloi, meaning "to choose" or a French form of the Old German Helewidis meaning "healthy" and "wood" or "wise".
 
Eloise has also been linked to the name Louise, but despite their similarities, there is no evidence either derived from the other. But don't let that stop you from using Eloise as an updated honor for a family Louisa!
 
However it originally came to be, the name was revived in the 19th century as Eloise, making the pronunciation more obvious to English speakers and the spelling more in line with the familiar Eleanor and Eliza. 
 
To some, Eloise will forever be the imperious little girl making mischief at the Plaza Hotel, while others might think of the rebellious Eloise from the TV series Bridgerton - a popular show which first aired in 2020, and likely influenced the rise of Eloise. 
 With that popular El- beginning and the potential nicknames Ellie, Lolly, Lola, Elsie, and Lolo, it is no wonder Eloise is climbing the charts.

Eloise

This iteration of the name makes the link to the ultra-popular Emma even more obvious. It lags behind alternate spelling Emmeline on the US Top 1000 list.
 Emmaline Henry was an American actress, best known for the role of Amanda Bellows on I Dream of Jeannie.

Emmaline

Heloise is an ancient name related to sleek, peppy classic Eloise. Both ultimately derive from the Germanic name Helewidis, which became Helewis in medieval England. In the twelfth century, the name was borne by the beloved of the French philosopher Pierre Abelard, who was considered to be one of the most learned women of the Middle Ages.
 
Most familiar to Americans as the author of Household Hints, Heloise is ready to reclaim its fashion status.

Heloise

Hollis is a surname-name used quietly for both genders. At last count, it was given to over 200 baby boys and 160 baby girls in the US. Now a Top 1000 name for boys, it could well break into the charts for girls too in the coming years. 
 
It has notable connections for both genders: Hollis Thompson is a professional (male) basketball player, while Hollis is an outsized favorite for girls in South Carolina, where Pete Hollis was a community folk hero. On the girls' side, it feels like an updated, more buttoned-up and distinctive spin on Holly.

Hollis

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.

Isannah

No, we don't consider Jane too plain. In fact, for a venerable and short one-syllable name, we think it packs a surprising amount of punch, as compared to the related Jean and Joan.
 A very old name, Jane has been around since Tudor times, in this country moving in and out of fashion. Jane was once so common that it became generic—as in Jane Doe and G.I. Jane—then spent a considerable time as the back end of such smooshes as Maryjane, Bettyjane, and Sarajane.
 We think it's time for a fresh look at Jane—and not only in the middle place. Just think of all the awesome Janes of the past, both real and fictive—from Austen to Addams to Eyre to Fonda. 
 Jimmy Kimmel recently named his baby girl Jane.

Jane

Leonie is a chic French and German form of a name that exists in a range of variations from Leona to Leonia to Leon to Leo to Lionel, all newly fashionable after a couple of generations in style limbo. 
 Pronunciation can be confusing: The first syllable can be pronounced as lee or lay, the second as on or own, and the accent can be on either the first or the second syllable or be evenly distributed over all three syllables of the name, so that it sounds like the male name Leon with an ee at the end. Take your pick, but know that others might often pick differently.
 Aunt Leonie is a major character in Proust's Remembrance of Things Past. Leonie Hemsworth is the mother of Liam and Chris and Leonie is the name picked by Monica Bellucci and Vincent Cassel for their daughter.

Leonie

Another feminine form of the old saint's name Mael. Spelled Maëlys, it is a very popular name in France today.

Maelys

Marigold, once found almost exclusively in English novels and aristocratic nurseries, is beginning to be talked about and considered here. It has a sweet, sunny, quirky feel. The marigold was the symbol of the Virgin Mary.

 Marigold appears in several children's book titles, such as Magic for Marigold, Once Upon a Marigold and Marigold in Godmother's House, and in the adult Quartet in Autumn by Barbara Pym. On the TV show 1600 Penn, Marigold was the President's young daughter. 

 The name got a big boost from its use in the period drama Downton Abbey, in which it belongs to a sweet little girl – which no doubt helped to endear parents to the name! It has risen dramatically since then, and recently entered the Top 1000 for the first time in 2022. We expect Marigold to be one to look out for as parents are looking for unique botanical names now that the previously offbeat Magnolia and Juniper are feeling less fresh.

Marigold

With its relation to Mount Olympus, home of the Greek gods, and to the Olympic games, this name has an athletic, goddess-like aura, making it the perfect Olivia substitute.
 A well-known art reference is the famous 1865 painting of a reclining nude by Edouard Manet titled Olympia. Contemporary bearers include former Maine Republican Senator Olympia Snowe and actress Olympia Dukakis.

Olympia

Mythological spirit of the waters; spelled Undine, she was an Edith Wharton heroine. 

Ondine

Opal is on the verge of a repolishing, following other jewel names like Ruby and Pearl. A Top 100 name during the first two decades of the twentieth century, the opalescent Opal has a good chance of coming back as another O-initial option.
 The ancient Greeks believed that opals were formed from the tears of joy wept by Zeus when he defeated the titans, and that the opal bestowed prophetic powers; the Romans considered it a symbol of hope and good fortune. It was a favorite gem of Queen Victoria.
 Opal Pelis is a character in Theodore Dreiser's seminal 1925 novel An American Tragedy.
 And keeping with the O theme, Opal is the birthstone of October, making it an appropriate choice for a little girl born in that month.

Opal

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

A strong Greek name with pan-European charm, Petra is a relatively recent feminization of Peter, though it relates back to an incredible ancient city in Jordan that was rediscovered in the early nineteenth century. 
 Currently among the most popular girl names in Croatia, Hungary, and Bosnia and Herzegovina, Petra ranked in the US Top 1000 every year from 1880 to 1951, reaching a high of #493 in 1929.
 There have been Petras in two European film classics: Ingmar Bergman's Smiles of a Summer Night and Rainer Werner Fassbinder's The Bitter Tears of Petra von Kant. The most prominent Petra in recent years is gorgeous supermodel Petra Nemcova, who is also an international disaster relief activist. Petra is also the name of a famous Christian rock band.

Petra

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

A sweet, nostalgic nosegay kind of name, Posy has been long fashionable in England, a country of gardeners, but this pretty bouquet-of-flowers name is still rarely heard in the US, though it could be seen as a more unusual possible alternative to Rosy or Josie.
 Posy is a little sister name in the Hunger Games series. Before that, Posy Fossil was a character in Noel Streatfeild's Ballet Shoes. Posy is by far the least popular version of the name, with Posie first, Posey second, and Posy used for only ten baby girls in the US last year.
 Posy (or Posey or Posie) could also work as a nickname for a range of other names, from Penelope to Sophia--it started as a pet form of Josephine. Other P-beginning flower names you may want to consider along with Posey: Poppy, Petal, Primrose.

Posy

Prudence, like Hope and Faith, is a Puritan virtue name with a quiet charm and sensitivity that is slowly returning to favor, though it hasn't yet registered on the charts.
 The White Album Beatles song Dear Prudence was written for Prudence Farrow, sister of Mia, who was with them in India when studying with the Marahishi Mahesh Yogi, seeking enlightenment.
 One notable historic bearer is Prudence Crandall, a 19th century Quaker schoolteacher who stirred controversy by admitting an African-American student. In pop culture, Prudence Halliwell was one of the three witches on Charmed, sister to Piper and Phoebe.
 Asset: Sweet nickname Pru/Prue.

Prudence

Kyra Sedgwick and Kevin Bacon chose this unusual diminutive for their daughter. 

Sosie

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

roseythelimited's list "Everything old new again" of 25 great name ideas: Adeline - Willa!

Everything old new again

Vintage/ unique American, English and French girls names.