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535 Boy Names That Start With O (with Meanings and Popularity)

Emma Waterhouse
By Emma Waterhouse
Updated Sun Jan 19 2025
535 Boy Names That Start With O (with Meanings and Popularity)

Boy names that start with O are on the way up, with old-timer Oliver and on-trend Owen leading the charge.

In Britain, the O initial is out on top for both boys and girls at the moment, with Olivia atop the girls' list and Oliver joined near the top of the boys' chart by amiable Oscar. Along with Oliver and Owen, other O names for boys in the US Top 500 include Oscar, Omar, Orion, Odin, Oakley, and Omari.

It's true that on the whole, we prefer our o's at the end of boys' names (as in popular Berry favorites Milo, Leo, and Hugo), but who's to say that you can't have both? Otto, Orlando, and Othello all rank in the Top 1000 baby names here on Nameberry... or how about Oslo, Orsino, or Octavio?

Original O names for boys trending now include Otis, Ozias, and Oakes.

Here, our full selection of boy names that start with O, ordered by their current popularity on Nameberry.

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Baby Names A-Z

Boy Names

  1. Oscar

    • Origin:

      English or Irish

    • Meaning:

      "God spear, or deer-lover or champion warrior"
  2. Oliver

    • Origin:

      Germanic, Latin

    • Meaning:

      "elf army; ancestor's relic; olive tree"
  3. Owen

    • Origin:

      Welsh

    • Meaning:

      "young warrior; well-born"
  4. Otto

    • Origin:

      German

    • Meaning:

      "wealthy"
  5. Orion

    • Origin:

      Greek

    • Meaning:

      "boundary, limit"
  6. Otis

    • Origin:

      Variation of Otto, German

    • Meaning:

      "wealthy"
  7. Ozias

    • Origin:

      Greek, Hebrew

    • Meaning:

      "my strength is God"
  8. Ozzy

    • Origin:

      Pet form of Oswald, Osborn, Osmond or Oscar, English

    • Meaning:

      "divine; deer"
  9. Orson

    • Origin:

      Latin and English

    • Meaning:

      "bear cub"
  10. Onyx

    • Origin:

      Word name

    • Meaning:

      "gem stone; claw, nail"
  11. Odin

    • Origin:

      Variation of Óðinn, Old Norse

    • Meaning:

      "god of frenzy; poetic fury"
  12. Oakley

    • Origin:

      English

    • Meaning:

      "oak wood or clearing"
  13. Oberon

    • Origin:

      Variation of Auberon

    • Meaning:

      "elf king; noble bear"
  14. Orlando

    • Origin:

      Italian variation of Roland

    • Meaning:

      "famous throughout the land"
  15. Oren

    • Origin:

      Hebrew

    • Meaning:

      "laurel or pine tree"
  16. Orpheus

    • Origin:

      Greek mythology name

    • Meaning:

      "the darkness of the night"
  17. Oswald

    • Origin:

      English

    • Meaning:

      "divine power"
  18. Orin

    • Origin:

      Variation of Oren or Oran, Hebrew, Irish, Scottish

    • Meaning:

      "laurel, light, song, little green one"
  19. Ocean

    • Origin:

      English, nature name

    • Meaning:

      "ocean"
  20. Oisin

    • Origin:

      Irish

    • Meaning:

      "little deer"