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Boy Names Ending in O

Boy Names Ending in O
Boy names ending in O offer many intriguing options.

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. The top names below rank among the current US Top 1000 Baby Names and are ordered by popularity. Unique names rank below the Top 1000 and are listed alphabetically.
  1. ArloHeart
    • Origin:

      Irish or English
    • Meaning:

      "between two hills"
    • Description:

      Arlo has many possible derivations along with its Irish and English roots. It may be a shortened form of the Italian name Carlo or the Spanish Carlos, and in Basque-speaking regions it is the word for area. In English, Arlo was used as a place name, Arlo Hill, by Edmund Spenser in his epic poem The Faerie Queene and is thought to derive from the Celtic word Aherlow, meaning “between two highlands.”
  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. OttoHeart
    • Origin:

      German
    • Meaning:

      "wealthy"
    • Description:

      Cutting-edge parents have revived this German name a la Oscar.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  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"
    • 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. 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.
  13. ApolloHeart
    • Origin:

      Greek mythology name
    • 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. But if Romeo and Venus are now deemed baby-appropriate, why not Apollo? Olympic speed skater Apolo Anton Ohno might inspire some parents. And now that it's been chosen by Gwen Stefani and Gavin Rossdale, it could take off as their first son's name—Kingston—has.
  14. 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.
  15. NeroHeart
    • Origin:

      Latin
    • Meaning:

      "stern"
    • Description:

      The association with the infamous Nero, the fiddling Roman emperor, would be unavoidable. But there was also the detective Nero Wolfe, hero of many mystery stories.
  16. MarcoHeart
    • Origin:

      Italian and Spanish form of Mark
    • Meaning:

      "warlike"
    • Description:

      Simple and universal, Marco is a Latin classic that would make a much livelier namesake for an Uncle Mark. It was used for her son by actress Jill Hennessy and goes well with surnames of any nationality.
  17. KenzoHeart
    • Origin:

      Japanese
    • Meaning:

      "strong and healthy"
    • Description:

      Kenzo is a common Japanese name with several creative bearers: the single-named fashion designer, prizewinning architect Kenzo Takada, and painter Kenzo Okada, which makes it internationally recognizable.
  18. InigoHeart
    • 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.
  19. 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.
  20. NemoHeart
    • Origin:

      Greek
    • Meaning:

      "nobody"
    • Description:

      One of the best known early Nemos was the captain in Twenty Thousand Leagues under the Sea, while the more familiar modern one is the animated little orange fish in the Disney movie. Unusual name well worth considering. By the way, there is also a Shakespearean Nemo and one in Dickens's Bleak House. An enchanting early comic strip by Winsor McCay was called Little Nemo.