Baby Boy Names That Start With O

O-names open on a round, resonant vowel that modern parents clearly love: Olivia and Oliver have both topped recent US charts. The section is compact, led by Latin roots (Olivia, Octavia) with Irish and Hebrew entries such as Owen and Obadiah rounding it out. This page narrows the letter to 135 boy names, where American, English and Hebrew origins run strongest. Oliver (No. 3) and Owen (No. 31) are the most popular O boy names in the 2025 U.S. Social Security rankings.

Browse Baby Boy Names Beginning With O

This page narrows the O list to baby boy names with meanings and origins. For a fresh batch, open the boy name generator preset for O. You can also compare the broader baby names that start with O, switch to baby girl names that start with O, or move to baby boy names that start with N and baby boy names that start with P.

Baby Boy Names That Start With O List

135 curated ideas with quick meanings or usage notes.

#1

Oliver

Meaning: Olive tree

Origin: Latin / French

#2

Oscar

Meaning: Divine spear

Origin: Gaelic

#3

Oakley

Meaning: Oak clearing

Origin: English

#4

Otis

Meaning: Wealth

Origin: Germanic / English

#5

Ollie

Meaning: Olive tree or ancestor descendant

Origin: English / Latin / Norse

#6

Otto

Meaning: Wealth or fortune

Origin: Germanic

#7

Owen

Meaning: Well-born or young warrior

Origin: Welsh

#8

Omar

Meaning: Flourishing, long-lived

Origin: Arabic

#9

Ozzy

Meaning: Divine power or spear of the gods

Origin: English / Germanic

#10

Osian

Meaning: Little deer

Origin: Welsh

#11

Oskar

Meaning: God spear or deer friend

Origin: Scandinavian

#12

Orson

Meaning: Bear cub

Origin: English / Latin

#13

Orhan

Meaning: Great leader or khan

Origin: Turkish

#14

Orion

Meaning: Rising in the sky

Origin: Greek

#15

Odin

Meaning: Inspiration, fury

Origin: Norse

#16

Orlando

Meaning: Famous throughout the land

Origin: Italian / Germanic

#17

Osman

Meaning: Young bustard bird or Ottoman form of Uthman

Origin: Turkish / Arabic

#18

Omer

Meaning: Sheaf of grain

Origin: Hebrew

#19

Olly

Meaning: Olive tree or ancestor descendant

Origin: English / Latin / Norse

#20

Oisin

Meaning: Little deer

Origin: Irish

#21

Ovie

Meaning: King or noble title

Origin: Urhobo / Nigerian

#22

Ozzie

Meaning: Divine power or spear of the gods

Origin: English / Germanic

#23

Omari

Meaning: Flourishing or God is highest

Origin: Swahili / Arabic

#24

Ocean

Meaning: Ocean, sea

Origin: English word name

#25

Obie

Meaning: Servant of God or heart

Origin: Hebrew / Igbo / English

#26

Oliwier

Meaning: Olive tree

Origin: Polish / Latin

#27

Olivier

Meaning: Olive tree

Origin: French

#28

Obi

Meaning: Heart or belt

Origin: Igbo / Japanese

#29

Odhran

Meaning: Little pale green one

Origin: Irish Gaelic

#30

Onyx

Meaning: Black gemstone

Origin: Greek

#31

Oswald

Meaning: Divine power

Origin: Old English

#32

Owais

Meaning: Little wolf

Origin: Arabic

#33

Oakley-James

Meaning: Oak clearing and James compound name

Origin: English / Hebrew compound

#34

Oran

Meaning: Little pale green one or light

Origin: Irish / Hebrew

#35

Oren

Meaning: Pine tree

Origin: Hebrew

#36

Orin

Meaning: Pale green one or pine tree

Origin: Irish / Hebrew

#37

Othniel

Meaning: God is my strength

Origin: Hebrew

#38

Owain

Meaning: Youth or well-born

Origin: Welsh

#39

Oaklee

Meaning: Oak clearing

Origin: Modern English

#40

Ozias

Meaning: Strength from God

Origin: Greek / Hebrew

#41

Opie

Meaning: Popular England and Wales given name

Origin: English usage

#42

Oslo

Meaning: Popular England and Wales given name

Origin: English usage

#43

Obaloluwa

Meaning: Popular England and Wales given name

Origin: English usage

#44

Olamide

Meaning: Popular England and Wales given name

Origin: English usage

#45

Oleksandr

Meaning: Popular England and Wales given name

Origin: English usage

#46

Ozan

Meaning: Popular England and Wales given name

Origin: English usage

#47

Ozil

Meaning: Popular England and Wales given name

Origin: English usage

#48

Obrempong

Meaning: Popular England and Wales given name

Origin: English usage

#49

Oliver-James

Meaning: Popular England and Wales given name

Origin: English usage

#50

Oluwadunsin

Meaning: Popular England and Wales given name

Origin: English usage

#51

Osvaldo

Meaning: Popular U.S. given name

Origin: American usage

#52

Octavio

Meaning: Popular U.S. given name

Origin: American usage

#53

Oswaldo

Meaning: Popular U.S. given name

Origin: American usage

#54

Omarion

Meaning: Popular U.S. given name

Origin: American usage

#55

Obed

Meaning: Popular U.S. given name

Origin: American usage

#56

Osbaldo

Meaning: Popular U.S. given name

Origin: American usage

#57

Octavius

Meaning: Popular U.S. given name

Origin: American usage

#58

Osiel

Meaning: Popular U.S. given name

Origin: American usage

#59

Osmar

Meaning: Popular U.S. given name

Origin: American usage

#60

Orrin

Meaning: Popular U.S. given name

Origin: American usage

#61

Olin

Meaning: Popular U.S. given name

Origin: American usage

#62

Om

Meaning: Popular U.S. given name

Origin: American usage

#63

Oziel

Meaning: Strength of God

Origin: Hebrew

#64

Osiris

Meaning: Popular U.S. given name

Origin: American usage

#65

Octavious

Meaning: Popular U.S. given name

Origin: American usage

#66

Obadiah

Meaning: Popular U.S. given name

Origin: American usage

#67

Odell

Meaning: Popular U.S. given name

Origin: American usage

#68

Ori

Meaning: Popular U.S. given name

Origin: American usage

#69

Octavian

Meaning: Popular U.S. given name

Origin: American usage

#70

Oryan

Meaning: Popular U.S. given name

Origin: American usage

#71

Otoniel

Meaning: Popular U.S. given name

Origin: American usage

#72

Osama

Meaning: Popular U.S. given name

Origin: American usage

#73

Olen

Meaning: Popular U.S. given name

Origin: American usage

#74

Oshea

Meaning: Popular U.S. given name

Origin: American usage

#75

Obinna

Meaning: Popular U.S. given name

Origin: American usage

#76

Orville

Meaning: Popular U.S. given name

Origin: American usage

#77

On-yu

Meaning: gentleness or warmth in Korean word usage, or Hanja-based readings depending on spelling

Origin: Korean

#78

Oden

Meaning: Distinctive U.S. given name

Origin: American usage

#79

Owyn

Meaning: Distinctive U.S. given name

Origin: American usage

#80

Oakland

Meaning: Distinctive U.S. given name

Origin: American usage

#81

Oak

Meaning: Distinctive U.S. given name

Origin: American usage

#82

Osias

Meaning: Distinctive U.S. given name

Origin: American usage

#83

Oaklen

Meaning: Distinctive U.S. given name

Origin: American usage

#84

Ousmane

Meaning: Distinctive U.S. given name

Origin: American usage

#85

Omri

Meaning: Distinctive U.S. given name

Origin: American usage

#86

Omega

Meaning: Distinctive U.S. given name

Origin: American usage

#87

Olyver

Meaning: Distinctive U.S. given name

Origin: American usage

#88

Omere

Meaning: Distinctive U.S. given name

Origin: American usage

#89

Oz

Meaning: Strength or courage

Origin: Hebrew

#90

Odyn

Meaning: Distinctive U.S. given name

Origin: American usage

#91

Ousman

Meaning: Distinctive U.S. given name

Origin: American usage

#92

Odysseus

Meaning: Distinctive U.S. given name

Origin: American usage

#93

Oumar

Meaning: Distinctive U.S. given name

Origin: American usage

#94

Olliver

Meaning: Distinctive U.S. given name

Origin: American usage

#95

Oziah

Meaning: Distinctive U.S. given name

Origin: American usage

#96

Ojas

Meaning: Distinctive U.S. given name

Origin: American usage

#97

Ostin

Meaning: Distinctive U.S. given name

Origin: American usage

#98

Ole

Meaning: Ancestor relic

Origin: Scandinavian

#99

Oluwademilade

Meaning: Distinctive U.S. given name

Origin: American usage

#100

Oluwatobi

Meaning: Distinctive U.S. given name

Origin: American usage

#101

Olan

Meaning: Distinctive U.S. given name

Origin: American usage

#102

Olsen

Meaning: Distinctive U.S. given name

Origin: American usage

#103

Oluwatobiloba

Meaning: Distinctive U.S. given name

Origin: American usage

#104

Othman

Meaning: Distinctive U.S. given name

Origin: American usage

#105

Orlin

Meaning: Distinctive U.S. given name

Origin: American usage

#106

Oswin

Meaning: Distinctive U.S. given name

Origin: American usage

#107

Orian

Meaning: Distinctive U.S. given name

Origin: American usage

#108

Omid

Meaning: Distinctive U.S. given name

Origin: American usage

#109

Olaoluwa

Meaning: Distinctive U.S. given name

Origin: American usage

#110

Oluwadarasimi

Meaning: Distinctive U.S. given name

Origin: American usage

#111

Omran

Meaning: Distinctive U.S. given name

Origin: American usage

#112

Osinachi

Meaning: Distinctive U.S. given name

Origin: American usage

#113

Olvin

Meaning: Distinctive U.S. given name

Origin: American usage

#114

Oseas

Meaning: Distinctive U.S. given name

Origin: American usage

#115

Olson

Meaning: Distinctive U.S. given name

Origin: American usage

#116

Osborn

Meaning: Distinctive U.S. given name

Origin: American usage

#117

Oakes

Meaning: Distinctive U.S. given name

Origin: American usage

#118

Obama

Meaning: Distinctive U.S. given name

Origin: American usage

#119

Olivia

Meaning: Olive tree

Origin: Latin

#120

Oluwasemilore

Meaning: Distinctive U.S. given name

Origin: American usage

#121

Osiah

Meaning: Distinctive U.S. given name

Origin: American usage

#122

Oneil

Meaning: Distinctive U.S. given name

Origin: American usage

#123

Obrian

Meaning: Distinctive U.S. given name

Origin: American usage

#124

Oluwaseun

Meaning: Distinctive U.S. given name

Origin: American usage

#125

Oluwaseyi

Meaning: Distinctive U.S. given name

Origin: American usage

#126

Osmond

Meaning: Distinctive U.S. given name

Origin: American usage

#127

Owynn

Meaning: Distinctive U.S. given name

Origin: American usage

#128

Olaf

Meaning: Ancestor relic

Origin: Germanic

#129

Orestes

Meaning: Mountain dweller

Origin: Greek

#130

Orpheus

Meaning: Darkness of night or myth name

Origin: Greek

#131

Octavianus

Meaning: Eighth

Origin: Latin

#132

Otho

Meaning: Roman cognomen of uncertain meaning

Origin: Latin

#133

Ovidius

Meaning: Sheep or of the Ovidius family

Origin: Latin

#134

Odd

Meaning: Point of a blade

Origin: Scandinavian

#135

Olav

Meaning: Ancestor relic

Origin: Scandinavian

How To Use This O Baby Names List

Use the list above as a research set, then narrow it by sound, meaning, origin, and how the name pairs with the family name. The generator preset is useful for quick discovery, while this page is better for comparing a larger fixed set of O names.

Gender Mix

This focused page currently includes 135 baby boy names beginning with O. For a wider comparison, browse the full baby names that start with O list.

Sound And Flow

Say each name with the surname and listen for repeated sounds, awkward initials, and rhythm. Short O names can feel direct, while longer names may offer more nickname options.

O Name Snapshot

This snapshot is calculated from the names on this page, so it changes with the actual O shortlist rather than using generic baby-name advice.

Length Mix

Short names

39

Compact names that can pair well with longer surnames or double-barrel middle names.

Examples: Otis, Otto, Owen, Omar, Ozzy, Odin.

Medium names

76

Balanced names with enough sound to feel complete while still staying easy to say.

Examples: Oliver, Oscar, Oakley, Ollie, Osian, Oskar.

Long names

20

Longer names that often bring formal style, rhythm, and nickname options.

Examples: Oakley-James, Obaloluwa, Oleksandr, Obrempong, Oliver-James, Oluwadunsin.

Common Endings

Ending sounds affect flow with the surname and can make names feel softer, sharper, brighter, or more traditional.

Ends in N

39

Examples: Owen, Osian, Orhan, Orion, Odin, Osman.

Ends in S

17

Examples: Otis, Owais, Oakley-James, Ozias, Oliver-James, Octavius.

Ends in E

13

Examples: Ollie, Ovie, Ozzie, Obie, Oaklee, Opie.

Ends in R

12

Examples: Oliver, Oscar, Omar, Oskar, Omer, Oliwier.

Popular O Baby Names In U.S. SSA 2025 Data

These are the highest-count O names in the U.S. SSA 2025 baby-name data. Treat this as a U.S. popularity signal, then use the full list above for meanings, origins, and a wider mix of styles.

Boy names

  1. Oliver rank #3 - 14,939 births
  2. Owen rank #31 - 7,190 births
  3. Oscar rank #223 - 1,620 births
  4. Omar rank #260 - 1,333 births
  5. Otto rank #277 - 1,241 births

Source: U.S. Social Security Administration national baby name data, 2025. SSA public files include names with at least five births in a year; non-name records are excluded from this editorial summary.

Useful Styles In This List

Popular and familiar

Recognisable names that are useful when you want the shortlist to feel familiar rather than experimental.

Examples: Oliver, Oscar, Oakley, Otis, Ollie, Otto, Owen, Omar.

Classic

Longer-lasting names that tend to work beyond one naming trend or birth year.

Examples: Oliver, Oscar, Otis, Ollie, Otto, Ozzy, Oskar, Orson.

Modern

Contemporary-feeling names, shorter forms, and names that fit current baby-name browsing habits.

Examples: Omer, Omari, Ocean, Oren, Oaklee, Osvaldo, Octavio, Oswaldo.

Nature

Names connected with plants, seasons, sky, water, animals, landscape, or natural imagery.

Examples: Oliver, Oakley, Osian, Orson, Orion, Omer, Oisin, Ocean.

Spiritual and meaning-led

Names where meaning, faith tradition, virtue, or symbolic use may matter more than sound alone.

Examples: Omari, Othniel, Ozias, Oziel.

Distinctive

Less expected choices that may suit parents looking beyond the most familiar shortlist.

Examples: Onyx, Oden, Owyn, Oakland, Oak, Osias, Oaklen, Ousmane.

How To Use This List

Use the entries as a starting point for characters, projects, profiles, quizzes, team names, stories, or naming research. The short explanations help the joke land without turning the page into a dictionary.

If you need a fresh set of ideas after browsing, the related generator can create more names you can copy, save, or refine with filters.

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Want more ideas like these?

Browse the list first, then use the related generator when you want a fresh batch to compare, copy, or save. For broader discovery, start with the main name generator and then narrow the results with a focused list like this one.

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