Oscar and Oliver and Olivia … the options for baby names that start with the letter O are seemingly endless. Take a look at this list of O names to find the perfect name for your little one.
- Olivia — Many believe that the name Olivia has Latin origins in that it means "olive branch" to represent a symbol of peace. This may be completely wrong, however, as scholars now believe that the origins of the name are on Norse and English families.
- 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.
- 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.
- 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.
- 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.
- 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.
- Obadiah
- 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.
- 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.
- Oona
- Odessa — Odessa isn't just a given name. It's actually a place name. The two most notable places with the name are Odessa in Ukraine, which is the third-largest city in the country and a major spot for tourism, and Odessa, Texas, which is the 28th-most populous city in the state. Odessa, Texas is also notable for being a former home to several members of the Bush family, including the two former presidents, George H. W. Bush and George W. Bush.
- Odette — Odette is most popularly known for the character in "Swan Lake." It is literally the princess who became a swan in the story.
- 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.
- Oaklyn
- Olin
- Oaklynn
- 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.
- Odalis
- Omar — Omar is a name that has been popular since the sixth century!
- Onyx
- Oakleigh — Oakleigh first appeared among the top 1,000 baby names for girls as the 856th most popular name of 2019. It continued to rank among the top 1,000 girl names from 2020-2021.
- 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."
- Ollie — Ollie as a given name is derived from the Latin term “oliva”.
- Osbaldo
- 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).
- Osmar
- Odalys
- Oaklee — Oaklee is a unisex baby name that has a near-even split among boys and girls. As of 2021, 56% of people named Oaklee are males, and 44% are males.
- 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.
- Obed
- 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.
- Osman
- Olive — Olive was extremely popular as a baby name in the early 1900s, but it reached close to number 1,000 by mid-century. Now, however, the name is re-entering the top 200 list with the rise of vintage names.
- Opal — Opal is also the birthstone for the month of October!
- Ophelia — Ophelia was most commonly associated with the name of the heroine in "Hamlet." Now, however, it is one of the top names for girls, ranking in the top 1,000.
- Oswaldo
- Oriana — Oriana as a given name can mean either “gold” or “dawn” but both names share a common origin in Latin “aurum”.
- Olga
- Om
- Oren — Oren is a given name of Hebrew origin. Oren is the masculine form of the name Orna. Oren is also a Turkish surname.
- 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.
- 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.
- Octavia — Octavia is a name that occurs in history, drama, and literature. Commonly found in Roman Imperial families, Octavia is the name of the elder and younger sisters of Caesar Augustus. A dramatized version of Octavia the Younger appears in Shakespeare's Antony and Cleopatra. Octavia is also the name of the first wife of Emperor Nero.
- Olyvia — Olyvia as a given name is a modern version of classic girl’s name Olivia. Olyvia takes inspiration from the vintage classic name Olympia. Olyvia is a less popular variant spelling than Alyvia.
- Oskar
- 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.
- Otto
- Omari
- Osvaldo
- 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.
And of course, if you'd like to discover more gender-specific names, you can check out baby boy names that start with O and baby girl names that start with O.