38 Baby Names That Start With the Letter "O"

Oh, the fun you can have with the letter "O!" From celebrity names like Oprah and Octavia to historical names such as Ophelia and Orson, there is no shortage of "O" names to choose from when picking a name for your little one.

Here, we've rounded up the most popular names that begin with the letter "O," all of which make unique options to help your baby boy or girl stand out from the crowd.

O'Shea

• Origin: Irish
• Meaning: Fine; Fortunate
• Famous Namesakes: O'Shea Jackson Sr. (known professionally as rapper Ice Cube) and his son, actor O'Shea Jackson Jr.
• Peak Popularity: O'Shea has yet to make it into the top 1,000 baby names in the U.S., making it rather uncommon.

Oakley

• Origin: British
• Meaning: Meadow of oak trees
• Alternative Spellings & Variations: Oaklee, Oakleigh, Oaklynn
• Famous Namesakes: The most well-known person associated with this name is American sharpshooter Annie Oakley.
• Peak Popularity: Oakley barely snuck into the top 1,000 baby girl names in 2013 and has since gained massive popularity. In 2021 it ranked No. 193.

Obadiah

• Origin: Hebrew
• Meaning: Servant of God
• Famous Namesakes: In the Bible, Obadiah was a prophet of the Old Testament.
• Peak Popularity: Obadiah is still a fairly uncommon name.

Ocean

• Origin: Greek
• Meaning: Sea
• Famous Namesakes: American singer-songwriter Frank Ocean and the fictional character Danny Ocean from the "Ocean's" movie franchise
• Peak Popularity: Ocean is considered a gender-neutral option but has become more popular for baby boys. In 2021 it ranked No. 711 for boys and No. 877 for girls.

Octavia

• Origin: Latin
• Meaning: Eighth
• Alternative Spellings & Variations: Octavius
• Famous Namesakes: American actress Octavia Spencer is a well-known person with this name.
• Peak Popularity: Octavia has been on the radar for over a decade and continues to gain popularity. Its most popular year to date was 2021 when it ranked No. 248.

October

• Origin: Latin
• Meaning: Historically, October means "the eighth month" (before the annual calendar was changed from 10 to 12 months).
• Peak Popularity: October has yet to join the ranks when it comes to the most popular U.S. names.

Odell

• Origin: Old English
• Meaning: From the woad hill
• Alternative Spellings & Variations: Odella, Odelle
• Famous Namesakes: American NFL football player Odell Beckham Jr.
• Peak Popularity: Odell was actually the most popular during the early 1900s. In 1973, it fell out of the top 1,000 baby names.

Odessa

• Origin: Greek
• Meaning: Wrathful; The Odyssey; of Odysseia
• Alternative Spellings & Variations: Odyssea, Odysseia
• Famous Namesakes: American actress Odessa Cleveland and Odessa Grady Clay, mother of legendary boxer Muhammad Ali
• Peak Popularity: Odessa reach peak popularity in 1908 and 1909. In 1956 it dropped out of the top 1,000 names.

Odette

• Origin: French
• Meaning: Wealthy
• Alternative Spellings & Variations: Odet, Odo
• Peak Popularity: Odette remains a fairly unique name.

Odeya

• Origin: Hebrew
• Meaning: I will thank God
• Alternative Spellings & Variations: Oda, Ode, Oded, Odeda
• Peak Popularity: Odeya is still considered a unique name, typically used for baby girls.

Odin

• Origin: Scandanavian
• Meaning: Frenzy
• Alternative Spellings & Variations: Oden, Odenn, Odin, Odinn, Odon, Odonn, Odyn, Odynn
• Famous Namesakes: American singer Nick Carter of the Backstreet Boys named his baby boy Odin.
• Peak Popularity: Odin started gaining popularity in 2008 and to date, its most popular year was 2021.
  

Ohara

• Origin: Japanese
• Meaning: Large plain
• Peak Popularity: Ohara remains a unique gender-neutral name in the U.S.

Oksana

• Origin: Russian, Hebrew
• Meaning: Praise to God
• Famous Namesakes: Ukrainian retired professional figure skater Oksana Baiul is likely the most well-known person with this name.
• Peak Popularity: Oksana is a fairly unique name for baby girls in the U.S.

Olena

• Origin: Ukranian
• Meaning: Shining light
• Alternative Spellings & Variations: Alena, Elena, Olenya, Olina
• Peak Popularity: Olena has yet to make the top 1,000 names for baby girls, but the variation Elena has become increasingly popular, ranking No. 53 in 2021.

Olin

• Origin: Scandanavian
• Meaning: Ancestor's heir
• Alternative Spellings & Variations: Olan, Olen
• Peak Popularity: Olin was most popular in the early 1900s and again in the 1930s before gradually falling off of the radar.
  

Olive

• Origin: English, Latin
• Meaning: Olive tree
• Alternative Spellings & Variations: Oliver, Olivia
• Famous Namesakes: Olive is a popular option for celebrity offspring, with actress Drew Barrymore, country singer Jake Owen, and actor couple Isla Fisher and Sacha Baron Cohen all choosing the name for their daughters.
• Peak Popularity: The name Olive was most popular over a century ago in the early 1900s, but has remained a solid contender for baby girls. In 2021 it ranked No. 182.

Olivia

• Origin: Latin
• Meaning: Olive; Olive tree
• Alternative Spellings & Variations: Alyvia, Livia, Livie, Lyvia, Olive, Olivie, Olyvia
• Famous Namesakes: American actresses Olivia Wilde and Olivia Munn, Australian actress and singer Olivia Newton-John, and American singer Olivia Rodrigo
• Peak Popularity: Olivia slid into the top 10 names for baby girls in 2003 and has continued to gain popularity. It has held the No. 1 spot for three consecutive years, from 2019 to 2021.

Ollie

• Origin: Latin
• Meaning: Peaceful; Olive tree
• Alternative Spellings & Variations: While Ollie is often a nickname for Olive, Oliver, or Olivia, it's a fun option by itself. Other spellings include Olie, Oli, Oly, and Olly.
• Famous Namesakes: One of the most notable people associated with this name was Ollie Johnston, an American motion-picture animator for Disney.
• Peak Popularity: The most popular year for Ollie was 1902.

Olsen

• Origin: Danish, Norwegian
• Meaning: Son of Olaf
• Famous Namesakes: Olsen is more commonly known as a last name. American actresses and sisters Mary-Kate, Ashley, and Elizabeth Olsen are some of the most famous people bearing the name.
• Peak Popularity: Olsen remains a relatively unique first name in the U.S.

Omari

• Origin: Swahili
• Meaning: Flourishing
• Alternative Spellings & Variations: Omaree, Omareigh, Omarie, Omary
• Famous Namesakes: American actor Omari Hardwick
• Peak Popularity: Omari reached the top 1,000 baby boy names in 1980 and has gradually become more popular. Its most popular year was 2018 when it reached No. 471.

Onyx

• Origin: Latin, Greek
• Meaning: Black gemstone
• Famous Namesakes: Popular Australian rapper Iggy Azalea named her baby boy Onyx.
• Peak Popularity: Onyx began to gain popularity in 2018 when it ranked No. 864 for baby boys, and as of 2021, it sat at No. 406.

Oona

• Origin: Irish
• Meaning: Lamb
• Alternative Spellings & Variations: Oonagh, Oonah
• Famous Namesakes: Oona King, a former Member of Parliament of the United Kingdom
• Peak Popularity: Oona remains a unique option for baby girls in the U.S.

Opal

• Origin: Sanskrit
• Meaning: Gem; Precious stone
• Famous Namesakes: Fictional character Opal Cortlandt from the soap opera "All My Children," and American aviator Opal Kunz.
• Peak Popularity: The most popular year for Opal was 1911, but as of 2021, still remains in the top 1,000 names for baby girls.

Ophelia

• Origin: Greek
• Meaning: Help; Helper
• Alternative Spellings & Variations: 
• Famous Namesakes: Most notably, Ophelia is the name of the heroine in William Shakespeare's play "Hamlet."
• Peak Popularity: Ophelia is a classic name that was most popular in the year 1900. In 2021, it ranked No. 321 for baby girls.

Oprah

• Origin: Hebrew
• Meaning: Fawn; Gazelle; Young deer
• Alternative Spellings & Variations: Ophrah
• Famous Namesakes: American talk show host, TV producer, actress, author, and philanthropist Oprah Winfrey is the most famous person with this name.
  
• Peak Popularity: Even with Oprah Winfrey's massive popularity, the name Oprah still remains rather unique among baby girls.

Oren

• Origin: Hebrew
• Meaning: Ash tree; Pine tree
• Alternative Spellings & Variations: Orenn, Orin
• Peak Popularity: The most popular year for Oren was 1903.

Oriana

• Origin: Italian, Latin
• Meaning: Dawn; Sunrise; Gold
• Alternative Spellings & Variations: Orianna, Oriane, Orianne
• Peak Popularity: Oriana is a unique name for baby girls in the U.S.

Orion

• Origin: Greek
• Meaning: Rising in the sky
• Alternative Spellings & Variations: Oarien, Oarion, Oarionn, Orien, Orienn, Orionn, Oryan, Oryen
• Famous Namesakes: In Greek mythology, Orion was a giant hunter, and a constellation is named after him.
• Peak Popularity: The most popular year for Orion was 2018.

Orlando

• Origin: Italian
• Meaning: Famous land; Glorious land
• Famous Namesakes: English actor Orlando Bloom is the most well-known person with this name.
• Peak Popularity: The most popular year for the name Orlando was 1975 when it ranked No. 246 for baby boys.

Orson

• Origin: English, Latin
• Meaning: Bear cub
• Alternative Spellings & Variations: Oarsen, Oarsin, Oarson, Oarsonn, Oarsyn, Orsen, Orsin
• Famous Namesakes: The most notable person with this name was American director, actor, screenwriter, and producer Orson Welles.
  
• Peak Popularity: The most popular year for Orson was 1901 before it fell out of the top 1,000 baby boy names, making it a unique option today.

Oscar

• Origin: Irish Gaelic
• Meaning: Spear of the Gods
• Alternative Spellings & Variations: Oskar
• Famous Namesakes: American former professional boxer Oscar De La Hoya, Dominican fashion designer Oscar de la Renta, Irish poet Oscar Wilde, American actor Oscar Isaac, and South African runner Oscar Pistorius
• Peak Popularity: The name Oscar has been on the radar for baby boys for over a century. Its most popular year was 1901 when it ranked No. 47, and in 2021, it remained in the top 500 names at No. 226.

Osiris

• Origin: Egyptian
• Meaning: Powerful; Mighty
  
• Famous Namesakes: Historically, Osiris was the Egyptian Lord of the Underworld.
• Peak Popularity: Osiris started gaining popularity in 2020 when it landed in the top 1,000 baby names for boys. In 2021 it sat at No. 948.
  

Osman

• Origin: Scandanavian, Turkish
• Meaning: The meaning of Osman varies from "God's protection" to "young snake."
• Famous Namesakes: Osman I, founder of the Ottoman dynasty
• Peak Popularity: The most popular year for Osman was 2019 which, so far, is the only year it has appeared in the top 1,000 names for baby boys.

Otis

• Origin: German
• Meaning: Wealth; Wealthy
• Famous Namesakes: American singer-songwriter Otis Redding and American inventor Otis Boykin
• Peak Popularity: Otis has remained a solid contender for baby boys since the early 1900s, with its most popular year being 1909.

Otto

• Origin: German
• Meaning: Wealth; Fortune
• Famous Namesakes: Otto the Great, founder of the Holy Roman Empire
• Peak Popularity: The most popular year for Otto was 1902, but remains moderately popular today. In 2021 it ranked No. 336 for baby boys.

Owen

• Origin: Irish, Welsh
• Meaning: Noble; Youthful; Well-born
• Alternative Spellings & Variations: Eowyn, Owena
• Famous Namesakes: American actor Owen Wilson and late Canadian professional wrestler Owen Hart
• Peak Popularity: Owen has gained a lot of popularity since the early 2000s, and its most popular year was 2019 when it ranked No. 21 for baby boys.

Ozias

• Origin: Greek, Hebrew
• Meaning: Salvation; God is strength
• Peak Popularity: Ozias remains a unique option in the U.S., most commonly for baby boys.

Ozzy

• Origin: English, German
• Meaning: God's power
• Alternative Spellings & Variations: Ozzie
• Famous Namesakes: English rock singer and TV personality Ozzy Osborne, Curaçaoan professional baseball player Ozzie Albies, and American reality TV star Ozzy Lusth
• Peak Popularity: The most popular year for Ozzy was 2019, when it finally landed in the top 1,000 names for baby boys.