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Cool Names with a Strong O

Cool Names with a Strong O
Baby names that begin or end with the letter O have long been particularly cool, especially (though there are a few feminine selections) for boys. The most popular girl name in the US, Olivia, has a strong O beginning, as does its rising masculine counterpart, Oliver. Both names are extremely popular throughout the Western world.

Along with Olivia and Oliver, other cool names with a strong O in the US Top 250 include Arlo, Diego, Enzo, Leo, Mateo, Milo, Olive, and Theo. Names with multiple Os may be especially cool — such as Apollo, Oona, Otto, and Rocco.

The options for cool names starting or ending with O range far beyond those offered here, of course, especially considering the entire world of Latinate baby names out there, but this group should give you a pretty good start.
  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. OpheliaHeart
    • Origin:

      Greek
    • Meaning:

      "help"
    • Description:

      Ophelia is a beautiful name that has long been hampered by the stigma of Hamlet's tragic heroine—for whom he seems to have invented the name—but more and more parents are beginning to put that association aside. There is also a gutsy Ophelia in Harriet Beecher Stowe's 1852 Uncle Tom's Cabin, which seems to have had some influence on baby namers at the time.
  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. OliverHeart
    • Origin:

      Germanic
    • Meaning:

      "olive tree"
    • Description:

      Oliver derives from Olivier, the Norman French variation of the Ancient Germanic name Alfihar ("elf army") or the Old Norse Áleifr ("ancestor's relic"), from which comes Olaf. Olivier emerged as the dominant spelling for its associations with the Latin word oliva, meaning "olive tree." Oliver was used as a given name in medieval England after the spread of the French epic poem ‘La Chanson de Roland,’ which features a character named Olivier.
  5. OscarHeart
    • Origin:

      English or Irish
    • Meaning:

      "God spear, or deer-lover or champion warrior"
    • Description:

      Oscar has Irish and Norse roots—Norse Oscar comes from the Old English Osgar, a variation of the Old Norse name Ásgeirr. The Irish form was derived from the Gaelic elements os, meaning “deer,” and car, “loving.” In Irish legend, Oscar was one of the mightiest warriors of his generation, the son of Ossian and the grandson of Finn Mac Cumhaill (MacCool).
  6. 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.
  7. 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.
  8. OttoHeart
    • Origin:

      German
    • Meaning:

      "wealthy"
    • Description:

      Cutting-edge parents have revived this German name a la Oscar.
  9. 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.
  10. OwenHeart
    • Origin:

      Welsh
    • Meaning:

      "young warrior; well-born"
    • Description:

      Owen was derived from two names—the Welsh Owain and the Celtic Eoghan. Each are connected to Eugene, which ultimately came from the Greek word eugenes, comprised of the elements eu, meaning good, and genes, “born.” Owen became a Welsh patronymic surname during the Renaissance. The legendary St. Owen was a Benedictine monk who was a follower of St. Chad.
  11. OttilieHeart
    • Origin:

      German, French
    • Meaning:

      "prosperous in battle"
    • Description:

      Ottilie and its diminutive Ottiline are a pair of names heard among the British upper crust, but have rarely been seen here since the 1880's. Ottilie does have a few cultural references: She is a key character in Goethe's Elective Affinities, Robert Louis Stevenson wrote a poem called To Ottilie, Franz Kafka had a sister named Ottilie, and it is the name of the protagonist in the John Wyndom sci-fi story Random Quest.
  12. OtisHeart
    • Origin:

      Variation of Otto, German
    • Meaning:

      "wealthy"
    • Description:

      Otis has a double image: it's cool and bluesy a la Otis Redding, but also an upscale, high-society name of the past. Otis has real appeal for parents attracted to its catchy O initial and combination of strength and spunk.
  13. 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.
  14. 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.
  15. OrionHeart
    • Origin:

      Greek mythology name
    • Meaning:

      "boundary, limit"
    • Description:

      Orion is a rising star, with both mythical and celestial overtones.
  16. OliveHeart
    • Origin:

      English, from Latin, nature name
    • Meaning:

      "olive tree"
    • Description:

      Though greatly overshadowed by the trendy Olivia, Olive has a quiet, subtle appeal of its own -- and is now enjoying a remarkable comeback. Olive is one of only four girl names starting with O on the US Top 1000. Cool couple Isla Fisher and Sacha Baron Cohen chose it for their daughter, reviving the name to stylishness, and now Drew Barrymore has a little Olive too, as has country singer Jake Owen.
  17. OliviaHeart
    • Origin:

      Latin
    • Meaning:

      "olive tree"
    • Description:

      Olivia is one of the top US baby names as well as one of the top girl names in English-speaking and European countries around the world.
  18. 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.
  19. 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.
  20. CleoHeart
    • Origin:

      Greek
    • Meaning:

      "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.