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Best Boy Names Ending in O

Pamela Redmond
By Pamela Redmond
Updated Thu Feb 01 2024
Best Boy Names Ending in O

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.

RELATED:

1770+ Boy Names Ending in O

Search Names by Last Letter

  1. Leo

    • Origin:

      Latin

    • Meaning:

      "lion"

    • Description:

      Leo is a strong-yet-friendly name that was common among the Romans, used for fourteen popes, and is now at its highest point ever in the US thanks in part to Leonardo "Leo" DiCaprio.
  2. Milo

    • Origin:

      Latin and Old German

    • Meaning:

      "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.
  3. Yarrow

    • Origin:

      Botanical name, English

    • Meaning:

      "rough stream"

    • Description:

      Highly unusual as a baby name for either gender, Yarrow is an herb that grows wild and has long been used for its medicinal property. It's named for the mythical Achilles, who was said to carry yarrow into battle.
  4. Arlo

    • Origin:

      Irish or English

    • Meaning:

      "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.
  5. Hugo

    • Origin:

      Latinized form of Hugh

    • Meaning:

      "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.
  6. 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.
  7. 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.
  8. Mateo

    • Origin:

      Spanish

    • Meaning:

      "gift of God"

    • Description:

      Mateo is a Latinate name that like Mia and Luca, is becoming popular far beyond its native Spanish community. With its fresh feel and charm, it made a surprise entrance to the boys' Top 10 in 2023.
  9. Theo

    • Origin:

      Diminutive of Theodore

    • Meaning:

      "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.
  10. Nico

    • Origin:

      Italian diminutive of Nicholas, Greek

    • Meaning:

      "people of victory"

    • Description:

      Nico is one of the great nickname names, full of charm, energy and effortless cool -- a neo Nick.
  11. Enzo

    • Origin:

      Italian variation of Henry, German

    • Meaning:

      "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.
  12. Beau

    • Origin:

      French

    • Meaning:

      "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.
  13. Cosmo

    • Origin:

      Italian, English, Greek

    • Meaning:

      "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.
  14. Apollo

    • Origin:

      Greek mythology name

    • Meaning:

      "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.
  15. Shiloh

    • Origin:

      Hebrew

    • Meaning:

      "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.
  16. 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.
  17. 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.
  18. Leonardo

    • Origin:

      Italian and Spanish variation of Leonard, German

    • Meaning:

      "brave lion"

    • Description:

      For centuries this name was associated primarily with the towering figure of Italian Renaissance painter-scientist-inventor Leonardo da Vinci, and was scarcely used outside the Latin culture.
  19. 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.
  20. Rio

    • Origin:

      Spanish, Portuguese, Japanese

    • Meaning:

      "river; place of the cherry blossoms"

    • Description:

      Rio is a reductive ranchero place-name with an attractive Tex-Mex lilt. No Doubt's Tom Dumont has a son named Rio Atticus.