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.
Generate More
For a fresh shortlist using the same starting letter, open the boy name generator preset for O, then save the names worth comparing.
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
- Oliver rank #3 - 14,939 births
- Owen rank #31 - 7,190 births
- Oscar rank #223 - 1,620 births
- Omar rank #260 - 1,333 births
- 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.
Generate more
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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