Unique Baby Names That End in O
Updated Thu Feb 05 2026
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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 ranks.
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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- Roscoe
Origin:
English, NorseMeaning:
"deer forest"Description:
Fairly popular a hundred years ago but out of the US charts since 1978, the quirky yet edgy Roscoe feels very much in step with the trending o-ending boy names popular now, such as Milo, Hugo, and Otto. A Top 1000 choice in the UK (albeit near the latter end), it could make a cool alternative to Ross, Russell, Robert, and Ronan.
- Otto
Origin:
GermanMeaning:
"wealthy"Description:
Otto is cool again. Long a quintessential Old Man Name, Otto has been promoted to trending darling of adventurous baby namers.
- Elio
Origin:
Italian, SpanishMeaning:
"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.
- Cleo
Origin:
GreekMeaning:
"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.
- Ivo
Origin:
Germanic, SlavicMeaning:
"yew wood, archer; God is gracious"Description:
Succinct, stylish, and catchy, Ivo has the energetic impact of other names ending in -o. It is a multicultural choice with two distinct origins, and, as such, is familiar across a variety of countries, ranging from the Netherlands to Brazil, from Portugal to Czechia.
- Cosmo
Origin:
Italian, English, GreekMeaning:
"order, beauty, universe"Description:
With a touch of celestial power, a hint of clunky charm, and the totally cool -o ending, Cosmo may well be finally shaking itself free of both the Seinfeld association (which made it a punchline of a joke) and the cartoon fairy association from The Fairly OddParents. In fact, it is in the Top 1000 in the UK and a favorite on Nameberry.
- Sholto
Origin:
Scottish from the GaelicMeaning:
"sower"Description:
Rugged but gentle, Sholto is a traditional Scottish first name, especially within the Douglas clan, with Sholto Douglas being its mythical ancestor. It is an Anglicized form of Sìoltach, meaning "sower".
- Kitto
Origin:
Cornish, diminutive of Christopher, Greek and LatinMeaning:
"bearer of Christ"Description:
Kitto updates Dad Name Christopher with a trendy o-ending short form. Use it as an honor name or an original nickname.
- Shiloh
Origin:
Biblical place-name, HebrewMeaning:
"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.
- Marlowe
Origin:
Variation of Marlow, EnglishMeaning:
"driftwood"Description:
Marlowe is very much in the air, with its lovely -o ending and the modern twist it offers on the likes of Margaret, Margot, Martha, and Marlene. But is it Marlowe, Marlow, or Marlo? Well, for a girl in the US at least, it's probably Marlowe, with this spelling the only one to appear in the Top 1000.
- Juno
Origin:
LatinMeaning:
"queen of the heavens; young"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 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.
- Apollo
Origin:
Greek mythology nameMeaning:
"destroyer; strength; father's light"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, and melodic option. Similar in style to Atlas and Atticus and similar in sound to Arlo, Paolo, Paul, and Ollie, Apollo entered the US Top 1000 back in 2012, and was propelled upwards after it was chosen by Gwen Stefani and Gavin Rossdale in 2014.
- Harlow
Origin:
English surnameMeaning:
"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.
- Bruno
Origin:
GermanicMeaning:
"brown"Description:
Tough-yet-cuddly Bruno is an international name even in its origins: it derives from the Germanic word for "brown" plus a Latin ending, and was borrowed as a color word in many European languages.
- Aurelio
Origin:
Italian; Spanish, variation of AureliusMeaning:
"the golden one"Description:
Aurelio is an energetic Italian name rarely heard in the US, 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.
- Viggo
Origin:
ScandinavianMeaning:
"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.
- Laszlo
Origin:
HungarianMeaning:
"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.
- Meadow
Origin:
Nature nameDescription:
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.
- Rio
Origin:
Spanish, Portuguese, JapaneseMeaning:
"river or 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!
- Orlando
Origin:
Italian variation of RolandMeaning:
"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.
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