Menu

1770+ Boy Names Ending in O

1770+ Boy Names Ending in O

Boy names ending in O offer many intriguing options, from such top names as Theo to unique O-ending names from Kylo to Zino.

Mateo is the most popular boy name ending with O right now, though there are nearly 100 O-ending boy names among the US Top 1000. Along with Mateo, other boy names in the US Top 1000 include Leo, Santiago, Diego, Romeo, and Antonio.

And there are hundreds more unique names for boys that end with the letter O worthy of your consideration. These range from the biblical Jethro to the ancient Greek Cosmo to the cool, modern Rio and Po.

Here are all Nameberry’s boy names that end with the letter O, ordered by their current popularity on Nameberry.

RELATED:

Boy Names

Search Names by Letter

  1. ArloHeart
    • 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.
  2. HugoHeart
    • 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.
  3. MiloHeart
    • 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.
  4. LeoHeart
    • Origin:

      Latin
    • Meaning:

      "lion"
    • Description:

      Leo was derived from the Latin leo, meaning "lion." Thirteen popes have carried the name, including St. Leo the Great. In Germanic languages, Leo has historically been used as a nickname for names including Leon and Leopold. In Latinate languages, Leonardo is considered a full form for Leo.
  5. OttoHeart
    • 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.
  6. TheoHeart
    • Origin:

      Diminutive of Theodore
    • Meaning:

      "gift of God"
    • Description:

      Many modern parents use Theo as the short form for Theodore rather than the dated Ted--including some celebs, such as Dallas Bryce Howard-- but others bypass the Grandpa name Theodore entirely and skip right to the hip nickname Theo. Short and ultra-chic, Theo's a cool, contemporary baby name choice.
  7. 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.
  8. ApolloHeart
    • 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.
  9. NicoHeart
    • 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.
  10. CosmoHeart
    • 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.
  11. MateoHeart
    • Origin:

      Spanish
    • Meaning:

      "gift of God"
    • Description:

      Mateo is a Latinate form of Matthew, which derived from the Hebrew name Mattiyahu, consisting of the elements mattan, meaning "gift" and yah, which references the Hebrew God. Mateo can also be spelled Matteo, which is the Italian variation. Matheo is an archaic Spanish spelling, although it is used in France as Mathéo.
  12. 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.
  13. EnzoHeart
    • Origin:

      Italian variation of Henry, also diminutive of Vincenzo and Lorenzo
    • Description:

      Enzo originated as the Italian variation of Heinz, a German name derived from Heinrich, related to Henry. It has historically been used as a short form for Italian names such as Vincenzo and Lorenzo. The most famous bearer of the name is Enzo Ferrari, founder of the luxury sports car brand.
  14. MatteoHeart
    • Origin:

      Italian
    • Meaning:

      "gift of God"
    • Description:

      This attractively energetic Italian version of the classic Matthew is primed to move further and further into mainstream American nomenclature. Mateo is technically the Spanish version, but many parents in the US use the two spellings interchangeably.
  15. 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.
  16. 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.
  17. 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.
  18. DiegoHeart
    • Origin:

      Spanish variation of James
    • Meaning:

      "supplanter"
    • Description:

      The energetic Diego is rising rapidly along with a lot of other authentically Spanish baby names that work perfectly well with surnames of any origin.
  19. ThiagoHeart
    • Origin:

      Spelling variation of Tiago, diminutive of Santiago
    • Meaning:

      "supplanter"
    • Description:

      Some high-profile soccer stars, such as Thiago Silva, have contributed to its success. The correct Portuguese pronunciation is chee-AH-go. Thiago is ranked Number 2 for boys in Puerto Rico.
  20. 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. In fact, Aurelio has recently entered the Top 1000 in the US in 2022. Next to follow might be latinate versions Aurelius and Aurelian.