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Cool Names with a Strong O

Pamela Redmond
By Pamela Redmond
Updated Sun Oct 29 2023
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. 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. Olivia

    • Origin:

      Latin

    • Meaning:

      "olive tree"

    • Description:

      Olivia, a lovely Shakespearean name with an admirable balance of strength and femininity, is the Number 1 name for baby girls in the US and one of the top girls' names around the world.
  4. Oliver

    • Origin:

      Germanic, Latin

    • Meaning:

      "elf army; ancestor's relic; olive tree"

    • Description:

      Oliver is an international star, ranking near the top of the charts throughout the English-speaking world and in a host of European and Latin American countries, from Norway to Chile, Slovenia to Switzerland. Why? Because Oliver is energetic and good-natured, stylish but classic, with a meaning symbolizing peace and fruitfulness.
  5. Oscar

    • Origin:

      English or Irish

    • Meaning:

      "God spear, or deer-lover or champion warrior"

    • Description:

      Oscar is one of the most stylish Old Man Names of our era. While it's softened slightly in popularity over the past 20 years, that may be considered a very good thing.
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. 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.
  11. Owen

    • Origin:

      Welsh

    • Meaning:

      "young warrior; well-born"

    • Description:

      Owen, a resonant Celtic name, has ranked among the Top 100 boys' names in the US for 20 years and is now at its highest point ever.
  12. 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.
  13. Ophelia

    • Origin:

      Greek

    • Meaning:

      "help"

    • Description:

      Floral, elegant, and bold, Ophelia re-entered the US Top 1000 in 2015 after more than 50 years off the charts. It has risen more than 700 spots since then and shows no signs of slowing down. Now in the US Top 300, could Ophelia one day become the next Olivia or Amelia?
  14. 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.
  15. 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.
  16. Ozias

    • Origin:

      Greek, Hebrew

    • Meaning:

      "my strength is God"

    • Description:

      A cool Biblical option that entered the US Top 1000 for the first time ever in 2024, Ozias gets extra points for its user-friendly nicknames Oz and Ozzie or Ozzy. Given to around 280 boys in 2024, it is five times more popular than it was in 2014.
  17. Orion

    • Origin:

      Greek

    • Meaning:

      "boundary, limit"

    • Description:

      Orion is a rising star, with both mythical and celestial overtones.
  18. Ottilie

    • Origin:

      German, French

    • Meaning:

      "prosperous in battle"

    • Description:

      Ottilie is trending in the UK, where the pronounced T helps the name sound pretty and delicate, rather like Amelie and Elodie. Ottilie is less popular in the US, where many Americans pronounce it as a near-homonym for "oddly".
  19. Odette

    • Origin:

      French, from German

    • Meaning:

      "wealthy"

    • Description:

      Odette is the good swan in Tchaikovsky's ballet Swan Lake, a role for which Natalie Portman won an Oscar ---and it would make a particularly soigne, sophisticated yet upbeat choice, unlike some of the more dated other 'ette'-ending names.
  20. Cleo

    • 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.