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Unique Baby Names That End in O

Unique Baby Names That End in O

Unique baby names that end in O (and the "o" sound) are among the very hottest right now, with the likes of Leo and Theo, Harlow and Margot rocketing up the popularity charts.

But there are still oodles of obscure O-ending names out there, just waiting to be discovered. We've polled our members to bring you 100+ of Nameberry's very favorite unique O-ending baby names, from Amparo and Benno to Yarrow and Zeno.

If you want to see even more baby names ending in O, check out our complete lists of Girl Names Ending in O and Boy Names Ending in O.

If quirky baby names ending in O are your thing, find our full list of rare, uncommon, and unique names ending in o here.

OttoHeart

  • Origin:

    German
  • Meaning:

    "wealthy"
  • Description:

    Cutting-edge parents have revived this German name a la Oscar.

CleoHeart

  • Origin:

    Greek
  • Meaning:

    "glory"
  • Description:

    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.

CosmoHeart

  • Origin:

    Greek, Italian, English
  • Meaning:

    "order, beauty"
  • Description:

    We all heard it on Seinfeld as the long-concealed first name of Kramer, then considered a punchline. Now some pioneering parents are embracing this expansive Greek name, which makes a creative and cool choice for a baby. Influential celebrity couple Scarlett Johansson and Colin Jost chose it for their son, born in 2021, which will likely drive Cosmo up in popularity. In the UK, it currently ranks within the Top 1000 boy names and is trending upwards.

ElioHeart

  • Origin:

    Italian, Spanish
  • Meaning:

    "sun"
  • Description:

    Elio is a sunny and spirited Italian and Spanish name that makes a great crossover prospect, which could catch on as Enzo has. Elio is also currently popular in France, ranking in the Top 250.

HarlowHeart

  • Origin:

    English surname
  • Meaning:

    "rock hill or army hill"
  • Description:

    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.

JunoHeart

  • Origin:

    Latin
  • Meaning:

    "queen of the heavens"
  • Description:

    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 o-ending Roman goddess name has become more and more prominent as a potential baby name — Coldplay's Will Champion chose Juno for one of his twins (whose brother is the kingly Rex).

ApolloHeart

  • Origin:

    Greek mythology name
  • Description:

    With mythological names rising, the handsome son of Zeus and god of medicine, music, and poetry among many other things might offer an interesting, if high-pressure, option. But if Romeo and Venus are now deemed baby-appropriate, why not Apollo? Olympic speed skater Apolo Anton Ohno might inspire some parents. And now that it's been chosen by Gwen Stefani and Gavin Rossdale, it could take off as their first son's name—Kingston—has.

ShilohHeart

  • Origin:

    Biblical place-name, Hebrew
  • Meaning:

    "tranquil"
  • Description:

    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.

CalypsoHeart

  • Origin:

    Greek
  • Meaning:

    "she who hides"
  • Description:

    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.

RoscoeHeart

  • Origin:

    Norse
  • Meaning:

    "deer forest"
  • Description:

    Fairly popular a hundred years ago but out of sight now, the quirky Roscoe deserves a place on every adventurous baby-namer's long list. It joins Rufus, Roman, Remy, Romulus, and Ray as one of the R names that sound fresh again after too many years of Robert, Richard, and Ronald.

IvoHeart

  • Origin:

    German
  • Meaning:

    "yew wood, archer"
  • Description:

    Ivo is an unusual, catchy name with the energetic impact of all names ending in 'o'. Hardly heard in the U.S., it is used a bit more frequently in England, as is the related Ivor, a favorite of such novelists as Evelyn Waugh and P.G. Wodehouse. Ivo is currently most popular in the Netherlands.

CocoHeart

  • Origin:

    Spanish and French pet name
  • Description:

    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.

DracoHeart

  • Origin:

    Greek from Latin
  • Meaning:

    "dragon"
  • Description:

    For as long as we all shall live, Harry Potter's sneering nemesis.

MarloweHeart

  • Origin:

    Variation of Marlow, English
  • Meaning:

    "driftwood"
  • Description:

    Is it Marlo, Marlow, or Marlowe? Suddenly they all seem very much in the air, in tune with rhyming cousins Harlow and Arlo. It all started when Margaret Julia Thomas began being known as Marlo (after being previously nicknamed Margie and Marlow). More recently, Jason Schwartzman used the e-ending version for his young daughter, Marlowe Rivers, as did Sienna Miller for her baby girl Marlowe Ottoline.

EchoHeart

  • Origin:

    Greek mythology name
  • Description:

    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.

LaszloHeart

  • Origin:

    Hungarian
  • Meaning:

    "glorious ruler"
  • Description:

    The Hungarian classic Laszlo, with its zippy 'z' middle and energetic 'o' ending, has become something of a hipster option, beginning to be considered by cutting-edge parents.

RoccoHeart

  • Origin:

    Italian from German
  • Meaning:

    "rest"
  • Description:

    Madonna did much to polish up the image of this old-neighborhood Italian choice when she picked it for her son with British director Guy Ritchie, and several years later it was also used by Rose Byrne and Bobby Canavale for their son. It now feels much more mainstream than many celebrity baby names, sharing the quirky appeal of some other so-far-out-they're-in baby names as Bruno and Hugo.

InigoHeart

  • Origin:

    Basque, medieval Spanish variation of Ignatius
  • Meaning:

    "fiery"
  • Description:

    Inigo, almost unknown in the U.S., is an intriguing choice, with its strong beat, creative and evocative sound, and associations with the great early British architect and stage designer Inigo Jones. The sixteenth-seventeenth century Jones shared his name with his father, a London clockmaker, who received it when Spanish names for boys were fashionable in England, especially among devout Roman Catholics.

MeadowHeart

  • Origin:

    Nature name
  • Description:

    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.

ViggoHeart

  • Origin:

    Scandinavian
  • Meaning:

    "war"
  • Description:

    Though to most Americans Viggo is a one-person name attached to intense actor Mortensen, it is actually an old Norse name dating back to the Vikings, and is currently the 32nd most popular appellation in Sweden. Viggo Mortensen is a Jr., sharing his name with his Danish father. We think this name is so, well, vigorous, that it might appeal to others as well. Taylor and Natalie Hanson seemed to agree when they chose it for their fourth child.

BrunoHeart

  • Origin:

    German
  • Meaning:

    "brown"
  • Description:

    Bruno is a popular name throughout Europe and South America that deserves more attention here. Its color meaning makes it one of the perfect names for November babies, or really a boy born in any of the autumn months.

OrlandoHeart

  • Origin:

    Italian variation of Roland
  • Meaning:

    "famous throughout the land"
  • Description:

    Orlando, the ornate Italianate twist on the dated Roland, with a literary heritage stretching back to Shakespeare and before, has appealing book-ended o's, and is open to combination with almost any last name, a la British actor, Orlando Bloom.

CatoHeart

  • Origin:

    Latin
  • Meaning:

    "all-knowing"
  • Description:

    Cato conjures up images of ancient Roman statesmen and southern antebellum retainers; it could have revival potential, with its 'O' ending and the current interest in the names of Greek and Roman antiquity.

IoHeart

  • Origin:

    Greek mythology name
  • Description:

    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.

EeroHeart

  • Origin:

    Finnish variation of Eric
  • Meaning:

    "eternal ruler"
  • Description:

    Creative gem perfect for an architect's son, in tribute to modern Finnish-American architect Eero Saarinen.

JagoHeart

  • Origin:

    Spanish and Cornish variation of Jacob
  • Meaning:

    "supplanter"
  • Description:

    Jago is a dashing alternative to overused favorite Jacob.

ValentinoHeart

  • Origin:

    Latin
  • Meaning:

    "strength, health"
  • Description:

    A dashing, dramatic and romantic Italian surname, associated with early movie heartthrob Rudolph, and later with Italian fashion designer Valentino (Garavani). Also the name of an early Roman saint, whose feast day marks the beginning of spring. Ricky Martin chose it for one of his twin boys.

JerichoHeart

  • Origin:

    Biblical place-name
  • Description:

    A biblical place name with trumpeting verve and strength.

RioHeart

  • Origin:

    Japanese
  • Meaning:

    "place of the cherry blossoms"
  • Description:

    Rio is one of Japan's most popular girls names, constantly sitting in that country's Top 10. Of course, Rio may also stem from the Portuguese and Spanish word for river, and the Brazilian city Rio de Janeiro. A truly international name for a cosmopolitan baby!

AurelioHeart

  • Origin:

    Italian variation of Aurelius
  • Meaning:

    "the golden one"
  • Description:

    Aurelio is an energetic Italian name rarely heard here, with an attractive aura. As the female version Aurelia gains greater notice, we expect to hear more from Aurelio too.

ZenoHeart

  • Origin:

    Anglicized form of Greek Zenon, related to Zeus, king of the gods
  • Description:

    Zeno, the name of two ancient philosophers, has a muscular dynamism that's lightened by its cheerful final vowel, resulting in a kind of offbeat sci-fi feel. Zeno of Citium was the founder of the Stoic school of thought, Zeno of Elea was another early, original Greek thinker, famed for his Paradoxes.

MiroHeart

  • Origin:

    Slavic
  • Meaning:

    "peace, world"
  • Description:

    Miro comes from the Slavic root word mir meaning "peace, world". Sometimes Miro is used as a diminutive of longer names like Miroslav or Vladimir, but it can also be given as a name in its own right. Miro has a wonderful meaning and fits right in with trendy names Arlo and Milo, as well as being an artistic honor name for Spanish painter and sculptor Joan Miró.

OsloHeart

  • Origin:

    Norwegian place name
  • Description:

    Oslo, the capital city of Norway, makes for an intriguing new place name, especially with its bookended o's, as in Otto. One berry has already used it and we predict others will follow.

AngeloHeart

  • Origin:

    Italian
  • Meaning:

    "angel, messenger"
  • Description:

    Old-school Italian name that could find new fans thanks to singer Adele, who chose it for her son after months of baby name mystery. Angelo is in the same name category as Rocco, the name of Madonna's son, and may get a fresh coat of cool.

HoratioHeart

  • Origin:

    English variation of Latin Horatius
  • Meaning:

    "hour, time"
  • Description:

    Like Horace, Horatio is a variation on the Latin Horatius, but its Shakespearean and optimistic Horatio Alger pedigree makes it an attractive up-and-comer, especially with its cool final o. A modern reference is the charismatic TV character Horatio Caine played by David Caruso in CSI: Miami.

IndigoHeart

  • Origin:

    Greek
  • Meaning:

    "Indian dye"
  • Description:

    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. Although most people don't think of it like this, Indigo might also be considered among the most stylish Greek baby names in use today. 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 is the name of a character in the Ntozake Shange novel Sassafrass, Cypress & Indigo, and was used for his daughter by Lou Diamond Phillips.

NemoHeart

  • Origin:

    Greek
  • Meaning:

    "nobody"
  • Description:

    One of the best known early Nemos was the captain in Twenty Thousand Leagues under the Sea, while the more familiar modern one is the animated little orange fish in the Disney movie. Unusual name well worth considering. By the way, there is also a Shakespearean Nemo and one in Dickens's Bleak House. An enchanting early comic strip by Winsor McCay was called Little Nemo.

LudoHeart

  • Origin:

    German
  • Meaning:

    "famous"
  • Description:

    This cool and quirky short form of the suave Ludovic could be an even-more-adventurous spin on Nico and Hugo.

DarioHeart

  • Origin:

    Italian variation of Darius
  • Meaning:

    "kingly or possess well"
  • Description:

    More creative and classier than Mario. It has regularly ranked near the bottom of the US Top 1000 over the last four decades. It does much better across the pond, and is especially popular in Italy, Spain, and Switzerland.

EliseoHeart

  • Origin:

    Italian and Spanish variation of Elisha
  • Meaning:

    "God is my salvation"
  • Description:

    This Latinate name would have no problem fitting into an American classroom. It has made frequent appearances in the US Top 1000 over the last several decades. Borne by several Spanish saints, it boasts both a rhythmic sound and popular o-ending.

CallistoHeart

  • Origin:

    Greek mythology
  • Meaning:

    "most beautiful"
  • Description:

    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.

CairoHeart

  • Origin:

    Place-name
  • Description:

    Exciting place name possibility with upbeat o ending. It debuted in the US Top 1000 in 2015.

AldoHeart

  • Origin:

    Italian from German
  • Meaning:

    "old and wise"
  • Description:

    A spirited German name very popular in Italy and occasionally used here, Aldo is one of the unique baby names with international flair. And names that mean wise have an enduring appeal.

EzioHeart

  • Origin:

    Greek
  • Meaning:

    "eagle"
  • Description:

    An operatic Italian option via South Pacific star Pinza, one of several Italian names currently hot in France.

OthelloHeart

  • Origin:

    Hebrew
  • Meaning:

    "he has the sound of God"
  • Description:

    Shakespeare's moor has exclusive ownership of this name.

RolloHeart

  • Origin:

    Latin form of Rolf
  • Meaning:

    "wolf"
  • Description:

    Rollo is a livelier, roly-poly, o-ending version of Roland.

VitoHeart

  • Origin:

    Latin
  • Meaning:

    "alive, life"
  • Description:

    Old World Italian name that might become fashionable in a so-far-out-it's-in way, like Enzo and Rocco. Main recommendation: It's among the rare boy names that mean life.

MungoHeart

  • Origin:

    Scottish nickname
  • Meaning:

    "my pet"
  • Description:

    Mungo is one of the most classic Scottish names but perhaps also among the most difficult names to carry. There is a St. Mungo whose proper name was Kentigern; he is the patron saint of Glasgow.

HeroHeart

  • Origin:

    Greek
  • Meaning:

    "demi-god"
  • Description:

    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.

BoscoHeart

  • Origin:

    Italian saint name
  • Description:

    Also, unfortunately, better known as a chocolate syrup. Borden and Bosco could play well together.
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