Boy Names That Start with O

Naming a new baby is an exciting experience for many parents. If you have a preference for boy names that begin with O, there are many great options to consider.

Some families might have a tradition of names starting with this letter, while others simply like the sound or meaning.

Whether you are looking for popular, unique, or cool names, there are plenty of choices. Here, we explore a variety of O names for boys to help inspire your decision.

Popular Boy Names That Start With O

Oliver

Oliver deserves its spot at the top, given its historical and international popularity. The name comes from the Germanic Alfher, meaning “elf warrior,” and is also linked to the Latin term for “olive tree.”

Its popularity was boosted by the French epic La Chanson de Roland and Charles Dickens’ novel Oliver Twist.

Owen

Owen has both Irish and Welsh origins, meaning “born from the yew tree.” It’s the Anglicized form of Eoghan and Owain, which are derived from Eugene.

Owen offers a blend of traditional roots with a modern feel. Actor Owen Wilson also adds a touch of modern flair.

Oscar

Oscar boasts Irish charm and Old Norse roots, meaning “deer friend” or “God’s spear.”

In Irish legend, Oscar was a mighty warrior, the son of Oisín and the grandson of Fionn Mac Cumhaill. Notable Oscars include writer Oscar Wilde, actor Oscar Isaac, and fashion designer Oscar de la Renta.

Omar

Omar is a name with Arabic and Hebrew origins, meaning “flourishing.” This popular name reflects growth and prosperity, making it a fitting choice for a blossoming baby boy.

Orion

Orion is a celestial and mythical name, perfect for those looking for something unique. This legendary hunter’s name was immortalized in the night sky as one of the brightest constellations, symbolizing strength and brilliance.

Odin

From Old Norse, Odin means “inspiration” and “rage.” He was the supreme Norse god of war, wisdom, and death, presiding in Valhalla.

This powerful name carries a weighty legacy.

Otto

Otto, meaning “wealthy” in German, has been revived recently. It was a name borne by the first Holy Roman Emperor and several other royals.

Its simple spelling gives it a modern touch while maintaining its wholesome appeal.

Oakley

Oakley is an earthy name derived from an English surname meaning “oak clearing.” It’s a sturdy choice for those seeking a nature-inspired name for their baby boy.

Omari

Omari, of Eastern African and Swahili origin, may be a variant of the Arabic Umar, meaning “flourishing.”

This name offers a softer, more unique ending with its “i.”

Onyx

Onyx, named after the gemstone ranging from black to white, is a trendy name climbing in popularity. The word itself comes from the Greek term for “claw,” making this an unusual yet stylish choice.

Unique Boy Names That Start With O

Obadiah

If you’re searching for a distinctive biblical name, Obadiah could be a perfect choice. This name appears in the Old Testament and translates to “serving Yahweh.”

It retains its uniqueness and offers a strong, spiritual connotation.

Oceanus

For those who love the ocean or have babies born under water signs, Oceanus is a captivating choice. The name is the Latin version of Okeanos from Greek mythology and represents the vast expanse of water believed to encircle the Earth.

Oceanus could be shortened to Ocean for a unique and modern twist.

Odhrán

Odhrán, pronounced O-rawn, comes from an ancient Irish word meaning “greyish brown” or “tan color.” It’s a popular name in Ireland and Northern Ireland but hasn’t yet gained widespread popularity elsewhere.

This charming name offers a wholesome feel.

Oedipus

Oedipus, meaning “swollen foot,” is a name rooted in Greek mythology. Despite its unusual origin, the name is rich in history and offers a distinct choice for those wanting something truly unique.

Olindo

Inspired by literature, Olindo is a name found in the sixteenth-century epic poem Jerusalem Delivered by Italian poet Torquato Tasso. This Italian name provides a touch of literary flair and historical depth.

Omega

Omega, meaning “last,” is the name of the final letter in the Greek alphabet. This gender-neutral name is both unusual and trendy, making it a bold choice for those who like to stand out.

Onesimus

For a unique Greek name meaning “beneficial” and “profitable,” consider Onesimus.

It’s also the name of a saint who escaped enslavement and met Saint Paul in prison. This name carries a strong historical and spiritual background.

Onuphrius

Onuphrius is an Egyptian name that translates to “he who is good” or “he who is happy.” It’s a rare but lovely name and was borne by a sixth-century Egyptian saint and hermit. This name is perfect for a joyful baby boy.

Origen

Origen is derived from a combination of the Egyptian god Horus and the Greek word genes, meaning “born.”

This name belonged to a third-century theologian from Alexandria and offers both historical and spiritual richness. It also has a unique sound similar to Oregon.

Ormond

Ormond is of Irish origin, derived from the name Ruadh, meaning “red.” It’s often used as a nickname for redheads.

If your child has red hair, Ormond could be an excellent choice, providing a unique twist to a traditional Irish nickname.

Cool Boy Names That Start With O

Oberon

This name from Shakespeare’s A Midsummer Night’s Dream is associated with the king of the fairies. It’s also the name of an outer moon of Uranus. Oberyn, known as the Red Viper of Dorne in Game of Thrones, is a cool alternative.

Octavius

Meaning “eighth” in Latin, it was a Roman family name often given to the eighth child. It’s a fitting name for a baby born in the eighth month or day.

Gaius Octavius was the birth name of the Roman emperor Augustus.

Oleksander

A trendy Ukrainian version of Alexander, meaning “defender of men.” This name is far from boring and offers cool diminutives like Oles or Sander, adding a unique twist.

Olympos

Named after the mountain home of the Greek gods, Olympos is a strong name for those who love mountains or myths. It carries an air of majestic strength.

Omiros

This modern Greek form of Homer avoids associations with The Simpsons character. A unique way to honor the Greek epic poet, it brings a classic yet fresh flavor.

Ondrej

A Slavic form of Andrew meaning “masculine,” pronounced AWN-dray. It offers a cool, unique alternative to more common names and stands out with its distinct sound.

Ophiuchus

For fans of reptiles, this Greek name means “serpent bearer.”

It also names a large constellation depicting a man holding a snake, adding a celestial connection.

Orazio

The Italian form of Horatius, with a trendy z and o ending. Possibly derived from the Latin hora meaning “hour, time, season,” it’s a zesty, stylish choice.

Orlando

An Italian version of Roland, meaning “famous throughout the land.”

Seen in literature, including Shakespeare, Orlando is both poetic and popular. Actor Orlando Bloom adds to its appeal.

Ozzy

A name with rockstar vibes, notable for its short length and double z’s.

Whether tied to rockstar Ozzy Osbourne or not, it carries a cool factor. It’s a diminutive of Oswald or Osborn, meaning “bear god” and “ruler.”

Cute Boy Names That Start With O

Odell

This name has a melodic and unique feel, perfect for a sweet little boy. Odell comes from an English place name that means “woad” and “hill.”

It’s also a nature-inspired name, adding an extra layer of charm.

Oisín

Oisín, of Irish origin, is pronounced o-SHEEN and means “little deer.” This name has a strong yet adorable vibe, being a warrior hero and poet in Irish legend.

It’s a great choice for those with Irish heritage.

Olaf

For fans of fairy tales, Olaf is an excellent choice. This Old Norse name is associated with the loveable snowman from Disney’s Frozen.

It means “ancestor’s descendant” and carries historical significance with several Norwegian kings and Saint Olaf.

Oli

Oli, a short form of the popular name Oliver, means “olive tree” or “elf warrior.” It’s a playful and cute option that can also serve as a nickname.

It’s simple yet full of charm.

Om

Om is a unique and spiritual choice with Sanskrit origins. As a sacred symbol often used in meditation, it stands out as a distinctive and meaningful name.

It could also be a sweet middle name for those who value spirituality.

Onfroi

Onfroi is the Norman French form of Humphrey and has wonderful meanings like “peaceful warrior” and “bear cub.” This name offers a cute and unique twist, making it great for honoring someone named Humphrey.

Ori

Ori has the meaning of “my light,” making it a cheerful and lovely name. It’s fitting for a boy who will brighten anyone’s life and is simple yet full of meaning.

Orson

With the meaning “bear cub,” Orson combines a sweet and mature vibe. It’s an English and Latin name that feels both wholesome and iconic, thanks to director and actor Orson Welles.

Orville

Orville means “golden city” in French and is famously associated with one of the Wright brothers, inventors of the airplane. It holds a sense of innovation and history, making it an intriguing choice.

International Boy Names That Start With O

Ọbatala

From African mythology, this name means “king of white cloth” in Yoruba. In Yoruba tradition, Ọbatala is believed to be the creator of the Earth and humans.

Ohannes

Ohannes is the Armenian version of John, meaning “God is gracious.” It’s a unique take on a classic biblical name, perfect for those with Armenian roots.

Okafor

In the West African Igbo language, Okafor means “boy born on Afor,” which is one of the four days in the Igbo week. It’s a meaningful choice for those wanting to celebrate their cultural heritage.

Oldrich

This Slovak name is a variation of the German name Ulrich, meaning “prosperity and power.” Oldrich is a sturdy option with the potential for cute nicknames like Ric or Oli.

Oleg

Oleg originates from the Old Norse name Helgi, which means “holy.” It was brought to Eastern Europe by the Varangians and remains a strong and historical choice in Russian culture.

Olegario

For fans of Spanish names and trendy endings, Olegario offers flair. Meaning “old” and “spear,” it’s a name borne by a bishop of Barcelona in the twelfth century.

Olek

This Polish name is a short form of Alexander, meaning “defender of men.” It’s a cool alternative to Alex, particularly for those with Polish heritage.

Oles

Oles is another short form of Alexander, commonly used in Ukraine. This name can also work as a nickname for Oleksandr or Oleksiy, adding versatility and charm.

Ottavio

Ottavio is a relaxed, playful Italian name meaning “eighth.” It’s an appealing choice, particularly for a boy born in the eighth month of the year.

Owain

Owain is a delightful Welsh name meaning “well-born.” It has ties to Arthurian legends, including a sixth-century prince of Rheged featured in the tale “Yvain, the Knight of the Lion.” This name is rich in history and culture.

Powerful Boy Names That Start With O

Odalric

This Ancient Germanic name, a variation of Ulrich, means “prosperity” and “power.” The element “ric” in the name signifies a “mighty ruler,” making it a strong choice for a future leader.

Odovacar

This German name means “wealthy” and “vigilant.” It has a determined sound and historical significance as the name of a fifth-century leader who became the first barbarian king of Italy by overthrowing the Western Roman emperor.

Odysseus

Originating from Greek and meaning “wrathful,” Odysseus evokes power. With its connection to the heroic figure in Greek legend, this name is a bold choice for a brave individual.

Óengus

An Irish form of Aonghus, this name means “one strength” and has royal connotations. It was borne by several Irish kings and is also the name of the Irish god of youth and love, adding a sweet element to its strength.

Ōkuninushi

This Japanese name, pronounced O-KOO-NEE-NOO-SHEE, means “master of the great country.” In Japanese mythology, he was the divine ruler of the land before being overthrown by heaven’s gods, making it a grand and powerful choice.

Ọlọrun

From African, Yoruban mythology, this name means “ruler of heaven.” Ọlọrun is considered a manifestation of the supreme god, making this name a mighty choice for a future leader.

Olympiodoros

An Ancient Greek name meaning “gift of Olympus,” Olympiodoros is tied to the home of the Greek gods, Mount Olympus. It’s a long and sturdy name perfect for a strong individual.

Orestes

This Greek name means “of the mountains,” capturing the strength and beauty of mountainous landscapes. It’s fitting for those who appreciate natural power.

Orpheus

Found in Greek mythology, this name means “the darkness of the night.” The legendary poet and musician Orpheus attempted to retrieve his wife from the underworld. Despite its dark undertones, the name has a strong and romantic feel.

Oswald

A vintage name meaning “God’s power,” Oswald offers cool nicknames like Oz, Ozzy, or Ozzie, making it a timeless yet strong choice.

Even More Boy Names That Start With O

Ocean

Ocean is often associated with the vast, deep waters of the sea, symbolizing tranquility and mystery.

Octave

Octave is a musical term representing an interval of eight notes, tying the name to harmony and rhythm.

Octavian

Octavian has Roman origins and often brings to mind historical figures and powerful leaders.

Octavio

Octavio is a variant of Octavian, sharing the same rich historical heritage and strength in its meaning.

Odalis

Odalis has a unique touch; it’s less common and has an air of distinctiveness and elegance.

Odd

Odd is a name from Scandinavian roots, meaning “point of a weapon” and lends an unusual, striking presence.

Oddmund

Oddmund combines “Odd” and “mund,” meaning protector, imbuing the name with a sense of strength and safety.

Oddo

Oddo has a bold and unique pronunciation, giving it a standout quality.

Oddvar

Oddvar carries a sense of heritage and tradition, with deep Scandinavian roots and meanings.

Ofra

Ofra is a name that hints at the natural world, representing a doe or fawn in Hebrew.

Ofri

Ofri is a short, sweet name with a modern feel, fitting for parents looking for a less conventional choice.

Ognen

Ognen is a Slavic name meaning “fire,” evoking imagery of warmth and energy.

Ognian

Ognian, similar to Ognen, carries a fiery essence, making it powerful and unmistakable.

Ognyan

Ognyan is another Slavic variant, continuing the theme of fire and intensity.

Oier

Oier has Basque origins and is both simple and distinctive, offering a fresh, modern sound.

Oissíne

Oissíne is rooted in Irish mythology, lending it a sense of timelessness and tradition.

Okeanos

Okeanos is the Greek personification of the ocean, evoking grandeur and endless depth.

Okechukwu

Okechukwu is of Igbo origin, meaning “God’s portion,” reflecting a strong spiritual connection.

Okonkwo

Okonkwo, also of Igbo origin, signifies a warrior or strongman, symbolizing strength and resilience.

Oktawian

Oktawian is the Polish variant of Octavian, retaining the historical and powerful connotations.

Ola

Ola is a short, cheerful Scandinavian name meaning “ancestor’s relic.”

Olabode

Olabode means “wealth has come home” in Yoruba, suggesting prosperity and good fortune.

Olamide

Olamide is a modern Yoruba name meaning “my wealth has arrived,” reflecting joy and success.

Olav

Olav is a traditional Norwegian name associated with kings and leadership.

Olavi

Olavi in Finnish culture bears a sense of history and respectability.

Olawale

Olawale in Yoruba means “wealth has come home,” reflecting hope and prosperity.

Oleh

Oleh is a common name in Ukraine, easy to pronounce and memorable.

Oleksiy

Oleksiy, also Ukrainian, offers a classic, yet contemporary appeal.

Olev

Olev is an Estonian name that is simple, strong, and unique.

Oliwer

Oliwer is a Polish variant of Oliver, modern yet retaining a classic touch.

Olle

Olle is a cute, common name in Sweden, often seen as friendly and approachable.

Olli

Olli, short and sweet, is a familiar name in Finland, perfect for easy recognition.

Olu

Olu is a short, powerful Yoruba name meaning “God,” simplifying yet strong.

Oluf

Oluf, another Scandinavian name, is solid and traditional, offering a sense of history.

Olusola

Olusola means “God has blessed” in Yoruba, a name full of positive meaning.

Oluwaseyi

Oluwaseyi in Yoruba means “God has done this,” a name filled with gratitude and faith.

Onofre

Onofre is a Spanish name with a distinctive, melodic sound.

Onyeka

Onyeka, of Igbo origin, means “Who is greater than God?” signifying strong faith.

Orla

Orla, an Irish name, means “golden princess,” reflecting nobility and beauty.

Ortwin

Ortwin is a name of German origin, combining “place” and “friend,” suggesting reliability and friendship.

Orval

Orval is a unique choice with a vintage feel, adding a touch of charm and tradition.

Osbert

Osbert, of English origin, means “bright god,” a name full of history and light.

Osbourne

Osbourne is associated with famous personalities and adds a strong, recognizable flair.

Ossian

Ossian has roots in Irish and Scottish folklore, connecting to poetry and legend.

Oswin

Oswin means “friend of God” in Old English, a name that is both comforting and strong.

Oskan

Oskan has Armenian roots, offering a unique, cultural touch.

Osric

Osric is old English for “divine ruler,” a name that embodies leadership and grace.

Ozazias

Ozazias has a biblical resonance, meaning “God has heard,” reflecting faith and spirituality.

Oziel

Oziel is a name with a melodious, modern sound, appealing and easy to remember.

Ozihel

Ozihel shares a similar modernity, adding a creative twist to traditional names.