150 Boy Names That Start With O: for Outstanding Boys

Boy names that start with O offer optimism, opportunity, and outstanding choices. These names range from highly original and modern to completely classic and opulent. You will find options from all over the globe that embrace different cultures, languages, and belief systems.

Read on to explore 150 male names starting with O to kickstart your baby-naming journey.

150 Out-of-This-World Boy Names With O

Here are 150 unique and classic O names for boys to consider.

1. Oak: Derived from the Anglo-Saxon word “ac,” meaning “oak,” representing dwellers near a prominent oak tree.
2. Oakleigh: Derived from the Old English name Accleia, meaning “from the oak meadow.”
3. Oakley: An alternate spelling of Oakleigh with the same meaning and origin.
4. Oaklynn: This gender-neutral Welsh name means “oak pond.”
5. Oates: Of Middle German, Old English, and Norman origin, meaning “prosperity and wealth.”
6. Oba: The first Nigerian name to make the list is regal, as Oba means “king.”
7. Obadias: A classic Hebrew boy’s name meaning “servant of God.”
8. Obadya: A variant of Obadiah with the same meaning and origin.
9. Obafemi: Many O names for boys are African, such as Obefami, which means “king” in Nigerian.
10. Obama: This famous East African Kenyan name means “to bend or lean.”
11. Obediah: A variant of the Hebrew name Obadiah, meaning “servant of God.”
12. Oberon: A cool Shakespearean character, Oberon means “noble and bear-like” in German.
13. Obert: A rare French-inspired name meaning “noble and bright.”
14. Obi: A unique Nigerian name meaning “heart.”
15. Obie: A short form of Obadiah, this Hebrew name means “servant of God.”
16. O’Brien: From the Irish and Gaelic languages, meaning “descendant of Brian.”
17. Oceanus: A rare Greek male name meaning “of the ocean.”
18. Ochs: An unusual High German nickname for a stubborn person, meaning “ox.”
19. Octaveous: This Roman clan name means “born eighth.”
20. Octavien: The perfect Latin name for someone whose favorite number is eight, meaning “eighth.”
21. Octavo: A variation of the Latin Octavien, meaning “in eighth” or “for the eighth time.”
22. Odall: Possibly a variation of the Old English Odell, meaning “woad hill,” referring to a plant used in dye.
23. Odd: Some boy names are wonderfully unusual, like this Scandinavian option that means “arrow or blade edge.”
24. Odean: In Jamaica, it means “advisor,” and in Irish, it translates to “descendant of the deacon.”
25. Odell: Derived from the Old English “woad hill,” referring to a plant used for making dye.
26. Odeon: The perfect name for musical baby boys, Odeon means “singing place” in Greek.
27. Odera: Of South Eastern Nigerian origin, meaning “once God writes it.”
28. Odhran: A lovely Irish choice, Odhran means “little pale-green one.”
29. Odie: A shortened nickname derived from Odell, meaning “woad hill.”
30. Odilo: German names like this are highly descriptive, meaning “fortunate or prosperous in battle.”
31. Odin: The father of all Norse gods, Odin means “lord of frenzy.”
32. Odis: Derived from the Old High German “ot,” meaning “prosperous and wealthy.”
33. Odolf: This German name derives from Adolf and means “noble or majestic wolf.”
34. Odon: Of Old English and Hungarian origin, meaning “wealthy defender or protector.”
35. Odysse: A famous name from Greek mythology, meaning “story of Odysseus.”
36. Odysseus: Derived from the Greek verb “odussomai,” meaning “to be angry” or “hate.”
37. Ofeer: Inspired by the biblical place Ophir, meaning “gold” in Hebrew.
38. Ogbanna: This Southern Nigerian name derives from Ogbonna and means “he resembles his father.”
39. Ogdan: A strong English option, Ogdan means “from the oak valley.”
40. Ogden: An alternate spelling of the Old English Ogdan, meaning “from the oak valley.”
41. Ogun: Nigerian names often carry great significance, like Ogun, meaning “god of war and metals.”
42. Ohad: If your child is cherished and worthy of praise, this Hebrew name nails it.
43. Ohed: Of Hebrew origin, meaning “loved one” and “servant of God.”
44. Ohene: Taken from the Ghanian Akan tribe, meaning “king.”
45. Ohndre: This foreign name is of Greek and French origin and means “man or warrior.”
46. Ohnjel: This six-letter unisex Greek name means “messenger of God.”
47. Ohtli: A gender-neutral Aztec name meaning “road or path.”
48. Oisin: This rare five-letter Irish name means “little deer” or “fawn.”
49. Okafo: A Nigerian Igbo name meaning “born on Afor (market) day.”
50. O’Keefe: This Irish boy’s name means “descendant of Keefe” and “kind and noble.”
51. Okeli: An unusual Nigerian name describing someone born on Orie, one of four market days.
52. Okonkwo: Another Nigerian market day name, meaning “man born on Nkwo day.”
53. Okotto: Our first Japanese entry on the list means “boar tribe.”
54. Olaff: A cool Scandinavian name describing a “descendant of the ancestors.”
55. Olaga: A sweet Samoan boy’s name meaning “life.”
56. Olan: Many male names come from Scandinavia, like Olan, which means “ancestor’s heir.”
57. Olar: Some Norwegian male names have unique meanings, like Olar, translating to “green beast.”
58. Olavo: This short and sweet Portuguese and Spanish name means “descendant of” and “ancestor’s relic.”
59. Ole: Of Danish and Norwegian origin, meaning “ancestor’s descendant.”
60. Oleg: This Slavic boy’s name is common in Russia, Belarus, and Ukraine and means “blessed.”
61. Oleksander: A Ukrainian version of the Greek Alexander, meaning “defender of humankind.”
62. Oleksei: This Ukrainian name derives from ancient Greek and means “guard, protect, and defend.”
63. Olexei: A variant of Aleksei, derived from the Greek Alexander, meaning “defender of humankind.”
64. Ollie: A cool nickname for Oliver, carrying the exact same meaning.
65. Olimpio: An edgy Greek boy’s name meaning “pertaining to Mount Olympus.”
66. Olivander: This English, Germanic, and Greek name means “protector of the olive tree.”
67. Oliver: The masculine version of Olive, meaning “olive tree” in Greek.
68. Olivero: An Old Italian form of Oliver meaning “olive tree.”
69. Olivier: The lovely French version of Oliver.
70. Olivor: A variant of the Greek Oliver with the same meaning and origin.
71. Olson: Of Norse origin and means “son of Olaf” and “ancestor and heir.”
72. Olympios: Meaning “of Mount Olympus,” this Greek name is steeped in mythology.
73. Olympus: Possibly meaning “from Mount Olympus” or “home of the gods” in Greek.
74. Omar: A top Arabic and Muslim name meaning “flourishing and long life.”
75. Omario: This posh name means “eloquent and articulate” and hails from Jamaica.
76. Omega: The last letter of the Greek alphabet, Omega means “the end.”
77. Omid: The first Persian boy’s name to hit the list, meaning hope.
78. Omotunde: This sweet and meaningful Nigerian boy’s name means “the child has returned.”
79. Ondrei: Of Greek and French origin, meaning “man or warrior.”
80. Onfre: A derivative of the Spanish name Onofre, meaning “peace and warrior.”
81. Onjel: Derived from the Latin Angelus, meaning “messenger of God.”
82. Onofredo: A long form of Onfre, meaning “peaceful warrior” in German and Spanish.
83. Onofrius: Possibly Italian or German, meaning “defender of peace.”
84. Onorato: Derived from the Latin Honoratus, meaning “honorable.”
85. Onslow: Of British and Arabic origin, meaning “enthusiast’s hill” or “hill of the passionate one.”
86. Onyx: A unisex English name describing a black gemstone.
87. Oratio: This Italian boy’s name has a beautiful aesthetic and means “prayer.”
88. Orford: Of Old English origin, meaning “ford of cattle.”
89. Orhan: Some names that start with O are Turkish, like Orhan, which means “great leader.”
90. Oriel: A brilliant Latin name for precious children, meaning “golden.”
91. Orion: This classic Greek boy’s name means “great hunter, dawning, and rising in the sky.”
92. Orkins: Derived from the Yiddish male name Orke of unknown meaning.
93. Orlando: An Italian variant of Roland, meaning “fame of the land” or “famous land.”
94. Ormon: Possibly of Irish descent, meaning “red, spear protector,” or “ship protector.”
95. Ormond: A variant of Ormon, meaning “red and spear protector” in Gaelic.
96. Ormondo: This French and Old English name means “mountain of bears.”
97. Ornet: A cool Old English and French name meaning “little eagle.”
98. Orric: Associated with strength, this Old English name means “oak tree.”
99. Ors: With roots in Old French, Ors means “hero.”
100. Orsen: The Latin form of Orson, meaning “a bear.”
101. Orsin: This unique French and Latin name means “bear cub.”
102. Orsini: This Italian name derives from the Latin “ursinus” and means “bear-like.”
103. Orson: Similar to Orsin, this French and Latin name means “bear cub.”
104. Orsonio: Continuing the Latin bear theme, this Spanish and Hispanic name is similar to Orsen.
105. Orvelle: An English version of Orville, meaning “golden town.”
106. Orville: An invented English name from literature, meaning “golden town.”
107. Orwell: A famous Anglo-Saxon place name, meaning “the branch of the river.”
108. Orwynne: An unusual English and Scottish name meaning “from Irving.”
109. Osage: This Native American Indian name means “people of the middle waters.”
110. Osborne: Derived from the Old Norse Asbjorn, meaning “divine bear” or “god bear.”
111. Osbourne: An alternative spelling of Osborne with the same meaning and origin.
112. Oscar: Of Irish origin, meaning “God spear, champion warrior, and deer-lover.”
113. Oshea: A Hebrew variant of Hosea and Joshua, meaning “to save.”
114. Osier: Derived from Old French and describes someone living near a willow tree or grove.
115. Osip: This quirky Hebrew name means “God will multiply.”
116. Osiris: Many names for boys are Greek, like Osiris, which means “powerful and mighty.”
117. Oslo: The Norwegian capital with an uncertain meaning of “meadow at the foot of the hill.”
118. Osment: Derived from the Old Norse Asmundr, meaning “God’s protection.”
119. Osmond: Similar to Osment, this English name means “God’s protector.”
120. Osmont: This English child’s name means “divine protector.”
121. Osred: Derived from the Old English Osræd, meaning “God’s counsel.”
122. Osrick: A regal Old English name meaning “divine ruler.”
123. Ossin: Surprisingly, this unusual name is Irish and means “little dear.”
124. Ostin: A French variant of Austin, meaning “great and magnificent.”
125. Ostynn: Of French and Latin origin, meaning “great, magnificent, exalted, and venerable.”
126. Osvald: Derived from the Old Norse Osvaldr, this Spanish and English version means “divine ruler.”
127. Oswald: Taken from the Old English “os” and “weald,” meaning “divine power.”
128. Oswinn: This Old English moniker means “God’s friend.”
129. Osyka: Of Native American Choctaw origin, meaning “eagle.”
130. Oszkar: A Hungarian version of the Irish Oscar, meaning “little deer” or “deer-lover.”
131. Otakar: The first Slovak name on the list, meaning “one who is watchful of wealth.”
132. Otess: Of Old English and German origin, meaning “son of Otto.”
133. Otildo: Related to the German name Odilo, meaning “prosperous in battle.”
134. Otis: In Old English, Otis means “son of Ode,” and “wealth” in German.
135. Otley: This Old English placename possibly means “Otto’s woodland clearing.”
136. Otmar: Derived from the German Audemar, meaning “wealth and prosperity.”
137. Otokar: This beautiful Czech name derives from Odoacer, meaning “wealthy and watchful.”
138. Ottfrid: An alternate of the Old German Ottfried, meaning “wealthy peace.”
139. Ottfried: From the Old German “ot,” meaning “wealth,” and “fridu,” meaning “peace.”
140. Ottild: This unisex German name means “prospers in battle.”
141. Ottman: Another powerful Old German name meaning “wealthy man.”
142. Otto: Sticking with wealthy German names, Otto is an absolute classic.
143. Ottorino: The Italian version of Otto, meaning “wealth and fortune.”
144. Ounslow: Possibly derived from the Old English place Hounslow, meaning “hound’s mound.”
145. Ousama: An Arabic respelling of Asama, meaning “lion-like.”
146. Ovadiah: One of the many Hebrew variations of Obadiah, meaning “servant of God.”
147. Owain: This ancient Old Welsh name means “wellborn.”
148. Owen: An Old English variant of the Welsh Owain, meaning “young warrior, wellborn, and noble.”
149. Oxford: An unusual boy’s name, Oxford means “ford where cattle cross.”
150. Ozzie: This catchy German nickname for the country down under means “bear god” and “divine.”

Boy Names That Start With O FAQs

What Are the Coolest Boy Names That Start With O?

Selecting the coolest boy names that start with O is primarily subjective. Names like Ozzie, Owen, Oscar, Olson, and Ollie are trendy and fun, while Oakley, Oates, and Obi have an edgy feel that many parents like.

What Are Some Unique Boy Names That Start With O?

If you want something entirely off the beaten path, consider names like Ochs, Ohtli, or Osyka. These rare choices offer deep cultural roots and distinctive sounds that stand out in any classroom.

What Is the Most Popular Boy Name Starting With O?

Oliver consistently ranks as the most popular O name for boys. It has held a top spot in global naming charts for years, loved for its friendly sound and classical roots.

Are There Any Biblical Boy Names That Start With O?

Yes, the Bible features several notable O names. Obadiah, Omar, and Othniel are excellent choices if you are looking for a name with strong religious and historical significance.

What Are Some Short Boy Names Starting With O?

Short names are punchy and easy to remember. Great options include Oak, Oba, Odd, Ole, and Obi. These single-syllable or two-syllable names make great first names and work perfectly as middle names.

What Are Good Middle Names for Boy Names That Start With O?

Because O names often have open, vowel-heavy sounds, they pair beautifully with strong consonant middle names. Classic choices like James, Thomas, William, and Alexander balance out the lyrical nature of an O first name.