Adagio

Aiko is a very common Japanese name with a lovely meaning that is rarely heard outside the Asian community.

Aiko

The color red was considered to have magical properties in early Japanese culture, with the power to cure blood and other illnesses.
Pronounced ah-kah-ko.

Akako

Musical choice best left to the boys, or variation of Alta.

Alto

Amparo is a medieval name related to the Virgin Mary most closely associated with the city of Valencia, in Spain. Although it does not appear at all on the most recent US name roster, meaning it was used for fewer than five babies last year, it was used in the US throughout the 20th century.

Amparo

If you're planning to have a younger one. 

Aneko

Abauro

Aceso

Acho

Aino

Akiho

Akiko

Alecto

Amphiro

Anaxo

Astero

This tiny but punchy name has multiple origins. It stands strong alone, but could be short for numerous names including Bonnie and Bodhi.
In Mandarin Chinese, Bo means "wave".

Brio is a musical term with great verve and energy, with possibilities as a first name on the heels of such choices as Cadence, Allegra, and Rio. 

Brio

Billow

A word name with fashionable o-ending that has associations with both the homespun fabric and the mottled cat. Alice Cooper named his daughter Calico decades ago.

Calico

Best known as one of the moons of Jupiter, Callisto was a nymph coveted by Zeus who was turned into a bear by Hera, becoming the Great Bear (Ursa Major) constellation.

Callisto

This hyper-rhythmic name has two evocative references. In Greek mythology, she was an island nymph, a daughter of Atlas, who delayed Odysseus from returning home. It is also a genre of West Indian music, originating in Trinidad and Tobago and largely popularized in the States by Harry Belafonte. 
 Calypso was the name of Jacques-Yves Cousteau's research ship--and would make a highly dramatic, musical choice.

Calypso

This evocative term for a stone or shell carved in relief could make a striking first name for a girl, though she would have a starring role in her story, rather than a cameo. 

Cameo

Chelo

Cleo, one of the few girls' names to boast the cool-yet-lively o ending, is of course short for Cleopatra, the name of one of the most powerful women in history.
 Cleo was most popular in the early decades of the twentieth century--when it was also used for boys. The opening of the Egyptian tombs along with the 1917 silent film starring Theda Bara popularized a range of now-obscure Cleopatra diminutives, including Cleora, and Cleola. 
 A distinguished bearer is the British jazz singer Cleo Laine, and there have been Cleos on two TV dramas: ER and Law & Order: Special Victims Unit.
Maybe the fact that Cleo was recently chosen by Friends' David Schwimmer will ignite a welcome revival.
 Sound-alike Clio is the name of the ancient Greek mythological muse of history and heroic poetry, one that is rich with modern charm and would also make an intriguing choice,

Cleo

Coco came to prominence as the nickname of the legendary French designer Chanel (born Gabrielle) and has lately become a starbaby favorite, initially chosen by Courteney Cox for her daughter Coco Riley in 2004. At first it was the kind of name that the press loves to ridicule, but we predict Coco's heading for more broad acceptance and even popularity.

Coco

Consuelo is a chic, highly sophisticated Spanish name that works well with Anglo surnames. It was regularly on the U.S. popularity list through 1983, reaching as high as Number 339 in 1930.
 The name is a reference to the Virgin Mary, as Nuestra Senora del Consuelo--our lady of consolation.
 Its most noted namesake in this country is Consuelo Vanderbilt, the beautiful only daughter of railroad millionaire William K. Vanderbilt. She was given the Spanish name in honor of her half-Cuban godmother. Another fashionable Consuelo was the American-born Italian countess Consuelo Crespi, the editor of Italian Vogue. In literature, Consuelo was used by George Sand for the title character of a novel about a beautiful Venetian singer. There have also been Consuelos in West Side Storyand Precious.
 Consuelo is still well-used in Spanish-speaking countries, and is especially popular in Chile. The unusual o-ending for a girl's baby name adds to her appeal.

Consuelo

Carmo

Carpo

Cato

Cello

Chariclo

Cielo

Clotho

Dido was the heroine of Virgil's Aeneid and of the opera "Dido and Aeneas," and in Roman mythology the founder of Carthage. A strong ancient name in the Juno mode, but it could have some awkward associations down the line. 
 The English singer-songwriter Dido was born with the equally unusual name Florian Cloud, but was called Dido since childhood.

Dido

Dodo is one of the few names of the cute repeating-sounds genre that is not alas so cute, being a slang word for someone brainless as well as the name of the infamous extinct bird. Dot, Dottie, Dory, or Thea are all preferable.

Dodo

One of those ultimate cool-girl names, played by Keira Knightley in a movie about a supermodel-turned-bounty hunter, but kids might associate it with the game. High profile British designer India Hicks used it for her daughter. As a <a href="https://nameberry.com/girl-names">girls' name</a>it's still very rare, used in 2015 in the US for only seven baby girls.

Domino

Some parents might like this energetic diminutive for Dorothy used in the Bush family, though the traditional Dottie and Dot seem to be coming back.

Doro

Dero 

Doto 

Drimo 

Echo, the pretty, resonant name of a legendary nymph, was the heroine of Joss Whedon's sci-fi series Dollhouse. Nick Hexum, of the band 311, named his daughter Echo Love.
 In the Greek myth, Echo was a nymph whose unrequited love for Narcissus caused her to fade away until all that was left was the sound of her voice. Obviously, a name with a lot of reverberations.

Echo

Eido

Eliso

Enyo

Erato

Flo is an antiquated nickname not often used these days, possibly because "Aunt Flo" is a euphemism for a period. 

Fallow

Farrow

Gwenno

Jean Harlow (born Harlean Carpenter), the original platinum blonde bombshell, was a symbol of 1930s glamour, a factor that first Patricia Arquette and then Nicole Richie and Joel Madden probably had in mind when they gave their daughters the distinctive surname name Harlow. 
 It hit the Top 1000 for the first time in 2009, one year after the arrival of Ms. Madden. Harlow would fit right in with contemporaries Arlo and Marlow(e).

Harlow

Despite the possibility of gender confusion, the Hero in Greek myth was a woman. Myleene Klass got that when she chose Hero for her daughter, and Sam Taylor-Wood and Aaron Johnson used it as their daughter's middle--and we wouldn't be surprised to see more girls with this heroic name.
 In Greek legend young Leander swam across dangerous waters every night to court his beloved Hero. In Shakespeare's Much Ado About Nothing, Hero is the love interest of Claudio and cousin of Beatrice.

Hero

Hallow

Halo

Hegeso

Heliko

Indigo is one of the most appealing and evocative of the new generation of color names. Color names have joined flower and jewel names -- in a big way -- and Indigo, a deep blue-purple dye from plants native to India, is particularly striking for both girls and boys. Indigo is the name of a character in the Ntozake Shange novel Sassafrass, Cypress & Indigo, and was used for his daughter by Lou Diamond Phillips.
 Some cultural references: The Indigo Girls are a folk duo, 'Mood Indigo' is a classic Duke Ellington jazz composition, and there is a 1970's New Age theory that Indigo children possess special, sometimes supernatural abilities.

Indigo

Io may be one of the slightest names in the book, but there aren't many two-letter names with as much substance as this Greek mythological example.  Io, a name used for the largest moon of Jupiter, was in classic myth raped by Zeus and escaped from him by changing herself into a cow. 

With Isabel getting so popular, parents are searching for new varieties of the name, and Isabeau is one that makes a lovely French twist. 
 Isabeau of Bavaria was the wife of King Charles VI of France--and it was possibly a nickname for Elisabeth. It is also the name of an opera by Pietro Mascagni, a retelling of the medieval English legend of Lady Godiva, and in the 1985 film Ladyhawke, Michelle Pfeiffer plays the heroine, Lady Isabeau d'Arjou, who assumes the form of a hawk during the day.

Isabeau

Ieso

Still evokes the spunky image of the character in Louisa May Alcott's Little Women. 

Juno is an ancient name that feels as fresh as if it had been minted, well, not yesterday, but in 2007. Since the release of the popular indie film Juno, this lively but strong Roman goddess name has held new potential as a baby name. Currently in the UK Top 500 and used in The Netherlands too, Juno is on the rise in the US - and is 15 times more popular than it was before the release of the film.
 
In Roman mythology, Juno was the sister and wife of Jupiter (yes, you did read that right) and the mother of Mars and Vulcan. The patron goddess of Rome and protector of women and marriage and the goddess of finance, Juno's name is heard in Virgil's Aeneid, Shakespeare's The Tempest, and Sean O'Casey's 1924 play Juno and the Paycock. The deity's name is of uncertain origin, but likely derives from the root -iuwen, meaning young. With Jupiter and Minerva, she made the Capitoline triad, whose worship was at the very center of Roman religion.
 
With its strong but sweet sound, reminiscent of vintage June and contemporary Juniper, with its appealing but rare-for-girls -O ending, it is unsurprising perhaps that Juno is a Nameberry favorite and on the rise in the "real world". Given to around 170 girls in 2023 - and to nearly 50 boys, it joins Artemis as a traditionally feminine goddess name that is becoming a unisex option. 
 
Actress Juno Temple and writer Juno Dawson are notable bearers of the name, while Coldplay's Will Champion chose Juno for one of his twins (whose brother is the kingly Rex).

Juno

Contrary to popular belief, the name Kahlo has German origins, rather than Spanish. It derives from kahl, a German word meaning "bald." Mexican Artist Frida Kahlo was born to a German father, photographer Guillermo Kahlo. 
 
Kahlo is given to baby girls and boys in roughly equal numbers each year. It's a modern hero name — the names of virtually all baby Kahlos were inspired by Frida.

Kahlo

Kallisto

Kelaino

Keto

Kielo

Klotho

Kranto

Kymo

Looks unusual and a little on the brink of weird; sounds like a little lioness named Leo. 

Llio

Lucero is a relative or nickname of Luz, meaning light. This intriguing name is swimming just beneath the Top 1000 for girls in the US.

Lucero

Leto

Liliago

Margot is suddenly a star again. After a nearly-half century absence, it hopped back on the Top 1000 list in 2013 and is on the rise. The Margot spelling is now given to three times as many baby girls as the Margo one.
 Makes sense, as Margot is a name that has a lot going for it: spelled with or without the final 't', it's one of the few <a href="https://nameberry.com/girls-names">girls’ names</a> with the dynamic o-ending sound; it's familiar, yet uncommon enough to be distinctive.
 
Margot originated as a French pet form of Marguerite, a name that ultimately derived from the Greek margarites, meaning "pearl." Other spellings include Margo and Margaux. Margaux Hemingway was originally Margot but changed the spelling to honor the wine from the French village of Margaux that was drunk by her parents on the night she was conceived.
 Movie buffs will remember Bette Davis's archetypal role as Margo Channing in All About Eve (the actress named her own daughter Margot), while balletomanes will associate the name with the great English dancer Margot Fonteyn (born Margaret).
 In the film Margot at the Wedding, Margot was played by Nicole Kidman; in The Royal Tenenbaums, Gwyneth Paltrow was Margot T. Gorgeous Australian actress Margot Robbie has made an impact here in the film The Wolf of Wall Street.

Margot

Perky, pretty nickname name that seems to have been invented by or for Marlo Thomas, who was born Margaret. Hipster mommy blogger Dooce named her newborn daughter Marlo Iris and comedian Rob Corddry named his daughter Marlo Stevenson.

Marlo

Meadow's upward popularity trajectory certainly suggests that the name has transcended its connection to The Sopranos.. In the US, more than 750 baby girls were named Meadow last year, a number we expect to keep rising.

If it can happen to Scarlett (O'Hara) and Atticus (Finch), it can certainly happen to lovely pastoral Meadow.

Before we let go of the Sopranos connection, how perfect was it that Tony Soprano's daughter's name was Meadow, suggesting that the TV mobster was once a kinder, gentler young dad?

Meadow

Milagro

Mio is a lovely Japanese <a href="https://nameberry.com/girls-names">name for girls</a> that has migrated beyond its native country. One Berry reports several young girls named Mio in Australia, and the name has potential in the rest of the English-speaking world for parents who want to move beyond Mia and Maya.

Monroe is a presidential name which, thanks to the immortal beauty of Marilyn Monroe, is catching on fast for baby girls. Mariah Carey and Nick Cannon chose it for their twin daughter, honoring Marilyn Monroe. Their use of Monroe as a <a href="https://nameberry.com/girls-names">girls’ name</a> did much to revive this Old Man name, a la Sydney, as a newly fashionable choice for girls.

Monroe

Menestho 

Minto

A much more dynamic nickname than Nicky for any of the Nic-names. Nico was chosen by Thandiwe Newton for her daughter. 
 The single-named German Nico (born Christa) was the iconic 1960s singer with Andy Warhol's Velvet Underground.

Nico

Neso

Ororo Munroe is the civilian name of African-American comic book heroine Storm, from the X-Men series.

Ororo

Pemphredo

Pero 

Phaino

Phaio

Phyto

Ploto

Plouto

Polyxo

Proto 

Prymno

Viviana's list "Girls Names Ending in "o"" of 153 great name ideas: Adagio - zeuxo!