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, ordered by their current popularity on Nameberry.

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  1. Elio
    • 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.
  2. Otto
    • Origin:

      German
    • Meaning:

      "wealthy"
    • Description:

      Otto is cool again. Long a quintessential Old Man Name, Otto has been promoted to trending darling of adventurous baby namers.
  3. Cleo
    • 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.
  4. Juno
    • 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).
  5. Cosmo
    • Origin:

      Greek, Italian, English
    • Meaning:

      "order, beauty, universe"
    • 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.
  6. Apollo
    • Origin:

      Greek mythology name
    • Meaning:

      "destroyer"
    • 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.
  7. Inigo
    • 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.
  8. Shiloh
    • 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.
  9. Calypso
    • 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.
  10. Marlowe
    • 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.
  11. Harlow
    • 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.
  12. Ivo
    • 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.
  13. Roscoe
    • 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.
  14. Aurelio
    • 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. In fact, Aurelio has recently entered the Top 1000 in the US in 2022. Next to follow might be latinate versions Aurelius and Aurelian.
  15. Echo
    • Origin:

      Greek mythology name
    • Meaning:

      "echo or sound"
    • 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.
  16. Jericho
    • Origin:

      Biblical place-name
    • Description:

      A biblical place name with trumpeting verve and strength.
  17. Cato
    • 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.
  18. Meadow
    • Origin:

      Nature name
    • Description:

      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.
  19. Viggo
    • 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.
  20. Bruno
    • Origin:

      Germanic
    • Meaning:

      "brown"
    • Description:

      It’s ok, we can talk about Bruno now!