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

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

Model Beverly Peele put the international place name Cairo on the map when she chose it for her daughter; it's much less faddish sounding than closer place names like Dallas and Dakota.
 
The name of the ancient city was derived from the Arabic term al-Kahira, meaning "the strong."

Cairo

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

Upper-crusty nickname occasionally used in Britain, particularly in 1930s novels featuring significant garden party scenes, but eclipsed here by Carrie et al. 

Caro

A nickname-name made famous by the uni-named Spanish singer Charo, whose full name was María del Rosario Pilar Martínez Molina Gutiérrez de los Perales Santa Ana Romanguera y de la Hinojosa Rasten.

Charo

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

Clio is the name of the ancient Greek mythological muse of history and heroic poetry, one that is rich with modern charm and would make an intriguing choice, especially thanks to its dynamic o-ending. Unlike the sound-alike Cleo, which brings up visions of Cleopatra, Clio is very much a stand-alone name.
 Other Greek muse names you might consider: Thalia and Calliope.

Clio

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

Doe is a soft and gentle-eyed middle name possibility and, like Fawn, one of the few animal names open to girls. 
 The Ballad of Baby Doe is a modern American opera based on the story of Elizabeth McCourt Tabor, known as Baby Doe. 
 So yes, use the sweet Doe as a middle name for your daughter--just not if her first name will be Jane.

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

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

Patricia Arquette and Nicole Richie named their daughters Harlow, so why not consider this other great early screen icon? 

Garbo

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

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

Ishiko

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 &mdash; well, not yesterday, but in 2007. Since the release of the popular indie film Juno, this lively but strong o-ending Roman goddess name has become more and more prominent as a potential baby name &mdash; Coldplay's Will Champion chose Juno for one of his twins (whose brother is the kingly Rex).
 
Juno was the sister and wife (hmmm) of Jupiter, and the mother of Mars and Vulcan. The patron goddess of Rome and protector of women and marriage, 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.

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

Kallypso

Kalypso

Japanese classic with optimistic meaning. 

Keiko

Kimiko

Lilou is a charming, rarely heard import. Occitan is a language spoken in Provence, in the south of France, in which the suffix "ou" denotes a pet form &mdash; thus, Lilou as a short form of Liliane or its Occitan form Liliana or Liliano. Its popularity in France--where it's currently Number 12--can be traced to the 1997 film The Fifth Element. 
 Pronounced lee-loo, this is an enchanting option.

Lilou

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

So many short forms of Margaret, from Peggy all the way through Maggie and Megan, are outdated now that Mago has value simply by being undiscovered.  But still, not very appealing.

Mago

Manon is an endearing French pet name for Marie or Marianne; it has the international yet straightforward feel that makes it a viable import. 
Manon of the Spring was a gorgeous French film, Manon Lescaut a 1731 novel by Abbe Prevost, set in France and Louisiana, that was controversial in its day. It formed the basis of operas by Puccini and Massenet, and several films and TV series.
 Manon is currently a Top 50 name in France and Belgium, and is also relatively common among Welsh speakers. British actors Damian Lewis, of Homeland and Helen McCrory have a daughter named Manon.

Manon

Margalo could make an intriguing spin on Margaret, with Margo as a nickname. The name appears in E. B. White's Stuart Little — as a bird. Margalo Gilmore (born Margaret) was a well-known British-born Broadway actress.

Margalo

Yes, it's pronounced with a long o sound at the end, just like Margo and Margot.  This spelling was popularized by supermodel, actress, and tragic Hemingway granddaughter Margaux, whose name spelling came courtesy of a bottle of French wine.  (The original spelling of her name was Margot; she changed it when she heard her parents were drinking a bottle of Chateau Margaux the night she was conceived.)

Margo itself is a diminutive of Margaret, which means "pearl" or, in its French version, "daisy."  Margaret or Marguerite would be more stylish variations now.

Margaux

Margo and Margot sound exactly the same, so why has the Margot spelling hopped back onto the Top 1000, outpacing Margo in numbers more than two to one? (Over 350 baby girls were named Margot in the most recent year, versus 150 named Margo.)

Credit the Gwyneth Paltrow character Margot in The Royal Tennenbaums and hot Australian star Margot Robbie. And maybe to some parents, the Margot spelling seems more like a complete name.
But it may also create some pronunciation confusion. And Margo gives you the same blend of fashionable o-ending and classic feel.

Margo

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

Has followed mother name Maureen off the radar screen.

Ro is a casual short form that doesn't usually appear on the birth certificate on its own. But it makes a friendly nickname for any girls' name starting with Ro-.

This name, which refers to Mary as the Virgin of the Dew, is all but unknown in the Anglo community, but popular enough in Hispanic families to put it in the U. S. Top 1000, at least until 2006. 

Rocio

Anglo parents are taking note of this Latina classic, thanks to actress Rosario Dawson and a character on Will & Grace. 

Rosario

Cool meets Born Again meets Brad and Angelina, who made Shiloh an instant star when they chose it for their daughter. While Shiloh has risen from obscurity thanks to its celebrity baby use, it hasn't become a star the way brother names Maddox and Pax have. It entered the Top 1000 in 2007, one year after the birth of Ms. Jolie-Pitt.
 The town of Shiloh is mentioned several times in the Old Testament--it was where Joshua and the Israelites assembled to cast lots for the seven tribes and for many years it was where the Ark of the Covenant resided, becoming a place of pilgrimage. Shiloh is also the site in Tennessee of a major, bloody, Civil War battle.
 Trivia tidbit: Shiloh is the name Angelina Jolie's parents had picked for their first child before her mother miscarried.

Shiloh

There's definitely a cold front of <a href="https://nameberry.com/list/89/winter-baby-names">names for winter babies</a> moving in, with Summer, Spring and Autumn giving way to Winter--plus North, January, Frost--and Snow. This name feels brisk, fresh, pure, evocative -- and magical. A haunting middle name choice. 
 Rare as a first name, there have been several notable surnamed Snows--including singers Hank and Phoebe, and scientist/novelist C.P. And then there's the dreamy Jon Snow in Game of Thrones.

Snow

Socorro is a Spanish and Portuguese word name taken from a title of the Virgin Mary, "Mary of Perpetual Succour." Its religious meaning makes it somewhat old-fashioned and not among the <a href="https://nameberry.com/baby-names/495/spanish-names-for-girls">Spanish names for girls</a> widely used in the US.

Socorro

Tamiko

Unfamiliar Asian choice that can work for a parent in search of something really different. 

Umeko

Umeyo

The o ending and the positive meaning in many languages makes this a winner, and with the feminine Vera making a surprise return, and the new love for the letter 'V', this becomes a name that has definite possibilities. 
 A geographical tie is to Vero Beach in Florida, former home of the Dodgers training camp.

Vero

An ancient tree that figures in literature from Shakespeare to Harry Potter and is believed to possess magical powers, Willow is a lovely name, as graceful as its inspiration.
 Willow's use as a given name derives directly from the willow tree, whose name was derived from the Old English word welig, meaning "willow." Willow trees are associated with grace and elegance, which gave way to the adjective "willowy." Other names with meanings related to willows include Arava, Willoughby, Dozier, Wellesley, Selby, and Salton.
 
This elegant and charming nature name has been chosen for their daughters by Will Smith and Jada Pinkett Smith, Michelle Monaghan and Pink. It's been a fast riser in recent years, climbing along with other Will names Willa, William and Will, having taken off here a year after the character of Willow was introduced on Buffy the Vampire Slayer in 1997.
 
Willow is also popular in other English-speaking countries: Australia and the UK, Canada, Ireland, and Scotland.
 
The name has transcended its one-time hippie aura to move into the realm of reappraised and appreciated <a href="https://nameberry.com/list/329/nature-baby-names">nature names</a>. The willow is believed by the Romani to possess the ability to heal the sick and rejuvenate the aged.
 
Pink was quoted as saying her choice was influenced by a willow tree she grew up near, and that it is the most flexible tree that nothing can break—no wind, no elements, it can bend and withstand anything.

Willow

The ethereal name of a Greek mythology sea nymph. 

Xantho

There are many in Japan, but for most Americans there's only one Yoko.
 
Yoko Ono writes her name with characters meaning "ocean" and "child".

Yoko

Yoriko

Yoriyo

Yoshiko

cielo

Christina Fonseca's list "Girls ending in O" of 58 great name ideas: Amparo - cielo!