Best Boy Names Ending in O
Updated Thu Feb 01 2024
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The best boy names ending in O include selections from those top names as well as unique O-ending names. The Top O-ending boy name in the US right now is the Spanish Mateo. Along with Mateo, other boy names ending in O in the US Top 500 include Leo, Santiago, Milo, and Theo.
Unique boy names ending in O that make our best list include Anselmo, Benno, Caio, and Laszlo. Of course, O is the usual ending for boys' names in Italy, Spain, and other Latinate countries. O-ending boys' names popular internationally include choices from those lands as well as boys' names with other origins that carry the O ending. We've included a few fashionable names here that don't technically end in O but in the O sound. The list is ordered by current popularity on Nameberry.
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- Arlo
Origin:
Irish or EnglishMeaning:
"between two hills"Description:
Quirky cool Arlo is now well and truly back. Last year it broke into the US Top 200 boy names and consistently ranks among the most popular boy names on Nameberry.
- Milo
Origin:
Latin and Old GermanMeaning:
"soldier or merciful"Description:
Milo is most commonly considered to be Germanic name derived from the Latin word miles, meaning "soldier." However, there is evidence to suggest it also may have independently spawned from the Slavic root milu, meaning "merciful." Milo predates brother name Miles, a variation that evolved when the name immigrated to the British Isles in the Middle Ages. Mylo is an alternate spelling.
- Leo
Origin:
LatinMeaning:
"lion"Description:
Leo is a strong-yet-friendly name that was common among the Romans, used for thirteen popes, and is now at its highest point ever in the US thanks in part to Leonardo "Leo" DiCaprio.
- Hugo
Origin:
Latinized form of HughMeaning:
"mind, intellect"Description:
Hugo, the Latin form of Hugh, has more heft and energy than the original -- and of course we love names that end (or begin, for that matter) with an o. This one is especially appealing because it's backed up by lots of solid history and European style.
- 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.
- Theo
Origin:
Diminutive of TheodoreMeaning:
"gift of God"Description:
See the popularity graph below for the name Theo? It's been heading straight uphill since 2010, when it hopped back onto the Top 1000 after a 60+ year absence.
- Mateo
Origin:
SpanishMeaning:
"gift of God"Description:
Mateo vaulted into the boys' Top 10 in 2023, ranking all the way up at Number 6. It is a Latinate names that, like Mia and Luca, is becoming popular far beyond its native Spanish community.
- Nico
Origin:
Italian diminutive of Nicholas, GreekMeaning:
"people of victory"Description:
Nico is one of the great nickname names, full of charm, energy and effortless cool -- a neo Nick.
- Beau
Origin:
FrenchMeaning:
"handsome"Description:
Beau suggests someone devilishly handsome, with a large measure of southern charm—a nice image to bestow on your boy. Often solely a nickname in the past, it's now standing firmly on its own. Beau has been on the Social Security list non-stop since 1969.
- Enzo
Origin:
Italian variation of Henry, GermanMeaning:
"estate ruler"Description:
You may be surprised to know that Enzo is now a Top 100 boy name in the US and the UK, where it has been climbing straight uphill since the turn of this century.
- 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.
- Apollo
Origin:
Greek mythology nameMeaning:
"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.
- Roscoe
Origin:
NorseMeaning:
"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.
- Ivo
Origin:
GermanMeaning:
"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.
- Arrow
Origin:
Word nameDescription:
Words are not always easy to translate into baby names, but the implications of being straight and swift lend this one great potential as a name. It also has the popular o-sound ending, which brings it further into the realm of possibility. Rising rock star Aja Volkman pulled a gender switch when she named her daughter Arrow Eve.
- Shiloh
Origin:
HebrewMeaning:
"tranquil"Description:
Haunting biblical and Civil War place-name; now unisex—especially after the mega-high-profile Brangelina couple picked it for their daughter. It debuted in the Top 1000 for boys in 2015.
- Cato
Origin:
LatinMeaning:
"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.
- Lorenzo
Origin:
Italian; Spanish, variation of LaurenceMeaning:
"from Laurentium"Description:
Latinizing Lawrence gives it a whole new lease on life. Like Leonardo, Lorenzo has been integrated into the American stockpot of names, partly via actor Lorenzo Lamas. Other associations are with Lorenzo de' Medici, the Florentine Renaissance merchant prince and art patron, Renaissance artists Ghiberti and Lotto, and the upstanding young man who married Shylock's daughter Jessica in Shakespeare's The Merchant of Venice.
- Santiago
Origin:
Place-name or LatinMeaning:
"Saint James"Description:
Santiago is a spirited Spanish name with great crossover potential. It's a place-name (a city in Chile), a surname, and the name of the patron saint of Spain.