Oscar, Oliver, Otis, Owen … There is no shortage of baby boy names that start with the letter O. Here’s a great list of options to help you find the perfect for your little boy.

Modern Baby Boy Names Starting with O

First we'll start with the most popular baby boy names in 2021:

  1. Oziel — Oziel is best if you want to use nicknames for it. Less than 100 parents call their sons Oziel, but it is likely because of the diminutive Oz.
  2. Ozias — Ozias comes from the name Uzziah. This name has other variations too, including Azariah and Azarias. Different translations of the Bible show varying names.
  3. Oseias — Oseias may not have broken the top 1000 yet, but it was the fastest-rising popular name for baby boys in 2017 when looking at percentages.
  4. Oakland — Boys make up 97.90 percent of the babies named Oakland. The first country to use the name was the United States of America.
  5. Orson — Orson Welles is probably the most famous individual with the name. He did not use his first name, however, as he wanted something more distinct. His given title was George.
  6. Obadiah
  7. Owen — Owen was a first name prior to the Renaissance and in modern times. It found its use as a surname, however, during the Renaissance in Wales.
  8. Ozzy — Ozzy is most often a nickname for Osborn, Oswald, and Osmond. Ozzy Osbourne is the most famous person with the title, but his given name is John.
  9. Oliver — Oliver was a name that was widely popular in the middle ages, but as soon as Oliver Cromwell came to office, it declined quickly. Now it is on the rise again with the popularity of vintage names.
  10. Olin
  11. Oscar — Oscar became extremely popular during the 1700s after poet James Macpherson wrote a series of epic works that included a character with the name. Even Napoleon Bonaparte was a fan. He named his godson Oscar, and the boy grew up to become King Oscar I of Sweden.
  12. Omar
  13. Onyx
  14. Ocean — Ocean is a modern name, but it has a couple of historical associations. Oceanus was given to a child on the Mayflower. Oceane has been a popular name for girls in France for decades.
  15. Osiel — Osiel Gouneo was born in 1990 in Mantanzas, Cuba, and today, he is an award-winning ballet dancer. He studied at the Cuban National Ballet School in Havana and has since performed all over the world in cities like Paris, Tokyo, New York, and Moscow. He's had starring roles in several notable ballets, like "Cinderella," "Romeo and Juliet," "Swan Lake," and "The Nutcracker."
  16. Ollie — Ollie as a given name is derived from the Latin term “oliva”.
  17. Osbaldo
  18. Osiris — Osiris has undergone a 21st-century revival as one of the top 1,000 baby names for boys. Similar Egyptian names that display high popularity include Cairo (which has ranked among the top 500 baby names for boys since 2015), and Set or Seth (which ranked among the top 500 baby names for boys in 2020).
  19. Osmar
  20. Omarion — Omarion unsurprisingly saw most of its popularity in the early 2000s thanks to American singer “Omarion”, a member of the boy band B2K who held most of their fame in the same timeframe.
  21. Obed
  22. Osman
  23. Oakley — Oakley is a gender-neutral name that experienced a major revival in the 2010s. In previous centuries, however, Oakley was primarily a male name. Oakley frequently ranked among the top 1,000 baby names for boys from 1901-1920. After a decades-long hiatus from the popular list, Oakley reappeared among the top 1,000 baby boy names in 2011. It became one of the top 500 baby boy names in 2017 and has remained popular ever since. Oakley first appeared among the top 1,000 baby names for girls in 2013. It went on to become one of the top 500 baby girl names in 2017 and has remained commonplace ever since.
  24. Oswaldo
  25. Om
  26. Oren — Oren is a given name of Hebrew origin. Oren is the masculine form of the name Orna. Oren is also a Turkish surname.
  27. Orion — Orion was a legendary hunter in Greek myth that was punished by the gods for boasting he would kill all living things on Earth. He was killed by a giant scorpion and was turned into a constellation of stars by either Artemis or Zeus, depending on the version of the story.
  28. Orlando — Orlando ranked among the top 500 baby boy names from the early 1950s through the early 2010s. As the name of a major city in Florida, Orlando is similar to other place names that double as given names such as Charlotte, Cheyenne, Dallas, Dayton, and Sydney.
  29. Oskar
  30. Odin — Odin is the top mythological being in Norse mythology. He is said to have killed Fenrir and is said to reside still in Valhalla.
  31. Otto
  32. Omari
  33. Osvaldo
  34. Otis — Otis became popular in America because of Revolutionary War hero James Otis. He was a lawyer in Boston who was an advocate for Patriot views.
  35. Octavio

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Unique Baby Boy Names Starting With O

While it’s fun to see what lots of other people are naming their babies, many people prefer to find baby names that are more uncommon. To that end, below is the some of the more unusual & unique boy names that start with O:

No unique O names yet but we’re adding new ones every day!

Did you find any winners in the list of rare boy names that start with O? If not, don't worry! We have thousands more names on the site to choose from. Be sure to check out all baby names that start with Oas well as middle names that start with O.