AHEAD: The ultimate list of O names for boys—plus their meanings and popularity.
If you’re looking for a cool boys’ name starting with the letter O, you’re in the right place!
Below, I’ve rounded up every single O name that’s even the slightest bit modern and cool.
For each name, you’ll find its meaning and current popularity—which will hopefully help you narrow down your list of favorites.
There are only 16 “O” names ranking in the top 1000.
There are also a bunch of other outstanding O names that are more rare (without being too out there).
Feel free to use the Table of Contents to jump to a specific style, or keep on scrolling and view all of these cool boys’ names starting with the letter O.
Related: Girl Names that Start with O
Table of Contents
Popular boy names that start with O
Kicking off our list of “O” names with some cool monikers that are popular in the United States right now. All of these are in the top 350.
Odin or Oden
- Name meaning: A god in Germanic mythology.
- Popularity: Odin ranks #327 and Oden isn’t ranking.
Oliver
- Name meaning: Olive tree.
- Popularity: #3
Omar
- Name meaning: Flourishing or long-lived.
- Popularity: #264
Orion
- Name meaning: A giant in Greek mythology. A constellation of a hunter.
- Popularity: #314
Oscar
- Name meaning: Friend of deer.
- Popularity: #226
Otto
- Name meaning: Wealth. Son of Ode.
- Popularity: #336
Owen
- Name meaning: Noble or young warrior.
- Popularity: #22
If you like these popular boy names that start with M you’ll also like this list of southern names.
Gender-neutral “O” names
All of these O names would work for a boy or a girl.
Oak
- Name meaning: Large trees with long lifespans.
- Popularity: This neutral name isn’t ranking.
Oakland
- Name meaning: A city on the San Francisco Bay.
- Popularity: This neutral name isn’t ranking.
Oakley
- Name meaning: Meadow of oak trees.
- Popularity: Oakley ranks #403 for boys and #193 for girls.
Ocean
- Name meaning: Body of water.
- Popularity: Ocean ranks #711 for boys and #877 for girls.
Octave
- Name meaning: An interval between music notes.
- Popularity: This great hippie name isn’t ranking.
Omari
- Name meaning: Flourishing or long-lived.
- Popularity: This great rainbow baby name ranks #492 for boys and isn’t ranking for girls.
Onyx
- Name meaning: A layered black stone.
- Popularity: #406
If you like these gender-neutral names that start with the letter O you’ll also like this list of nonbinary names.
Cool “O” names
These boys’ names starting with O are perfect if you want something a little edgy but not too far out there.
Olsen or Olson
- Name meaning: Son of Olaf or Ole.
- Popularity: This boys’ name isn’t ranking.
Oren or Orin or Orrin
- Name meaning: Ash or pine tree. Little pale green one.
- Popularity: This boys’ name isn’t ranking.
Orson
- Name meaning: Bear.
- Popularity: This boys’ name isn’t ranking.
Otis
- Name meaning: Wealth. Son of Ode.
- Popularity: #647
Ozzy
- Name meaning: Short for Oswald, Osborn, or Osmond.
- Popularity: #712
If you like these cool boy names that start with O you’ll also like this list of edgy names.
Rare “O” names
If you’re looking for a boys’ name starting with O that’s off the beaten path, one of these rare choices might be for you!
Octavius
- Name meaning: Eighth.
- Popularity: This boys’ name isn’t ranking.
Orlando
- Name meaning: Renowned throughout the land. A city in Florida.
- Popularity: #754
Orpheus
- Name meaning: A musician, poet, and prophet in Greek mythology.
- Popularity: This unique boys’ name isn’t ranking.
Osborn
- Name meaning: Bear of God.
- Popularity: This boys’ name isn’t ranking.
Osiris
- Name meaning: Ancient Egyptian god of fertility, agriculture, and the afterlife.
- Popularity: #948
Osman
- Name meaning: Many possible meanings including ‘man of God’ and ‘ox driver’. (Prince Osman founded the Ottoman Empire).
- Popularity: #982
Osmond
- Name meaning: God protects.
- Popularity: This boys’ name isn’t ranking.
Oswald
- Name meaning: Power of God.
- Popularity: This German boys’ name isn’t ranking.
If you like these rare boy names that start with O you’ll also like this list of space names for boys.
Final thoughts on “O” boy names
Hopefully, you’ve found a few lead contenders on this list, or at least come away with some baby name inspiration.
Whether you prefer a name that’s popular, cool, gender-neutral, or rare, all of these boys’ names are fantastic choices.
Congratulations and good luck choosing the perfect name for your son!
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