Some letters feel familiar in baby name lists, while others stand out because they appear less often. The letter O belongs to that second group.
It has a distinct sound that feels strong, open, and memorable, which is why many parents are drawn to it when thinking about names for a son.
Across cultures and languages, boys’ names that start with O carry a wide range of meanings.
Looking through a well-organized list helps parents see how different male names that start with O sound, what they mean, and where they come from.
This collection brings many of those names together in one place, making the search easier and more thoughtful.
Unique Boys’ Names That Start with O
Parents who want something a little different often look for uncommon names. These unique male names that start with O highlight distinctive choices from many cultures.
1. Oliver
Meaning: Olive tree; symbol of peace
Origin: Latin
2. Owen
Meaning: Young warrior; well born
Origin: Welsh
3. Oscar
Meaning: Champion warrior; deer friend
Origin: Irish / Old English
4. Omar
Meaning: Flourishing; long-lived
Origin: Arabic
5. Otis
Meaning: Wealth; fortune
Origin: German
6. Orion
Meaning: Hunter in Greek mythology; rising in the sky
Origin: Greek
7. Odin
Meaning: Inspiration; wisdom; fury
Origin: Norse
8. Oakley
Meaning: Meadow of oak trees
Origin: English
9. Onyx
Meaning: Black gemstone
Origin: Greek
10. Orlando
Meaning: Famous land
Origin: Italian / Germanic
11. Osvaldo
Meaning: Divine power
Origin: Spanish / Germanic
12. Octavio
Meaning: Eighth
Origin: Latin
13. Omari
Meaning: Flourishing; long-lived
Origin: Arabic / Swahili
14. Oren
Meaning: Pine tree
Origin: Hebrew
15. Otto
Meaning: Wealth; prosperity
Origin: German
16. Orville
Meaning: Golden town
Origin: French
17. Oswald
Meaning: God’s power
Origin: Old English
18. Olin
Meaning: Ancestor’s heir
Origin: Scandinavian
19. Osgood
Meaning: God is good
Origin: Old English
20. Osmond
Meaning: Divine protection
Origin: Old English
21. Osbert
Meaning: Bright god
Origin: Old English
22. Oakes
Meaning: From the oak trees
Origin: English
23. Oak
Meaning: Oak tree
Origin: English
24. Olan
Meaning: Little Rock
Origin: Gaelic
25. Olav
Meaning: An ancestor’s relic
Origin: Norwegian
26. Olaf
Meaning: Ancestor’s descendant
Origin: Norse
27. Oleg
Meaning: Holy; blessed
Origin: Slavic
28. Olis
Meaning: Noble; kind
Origin: English
29. Olindo
Meaning: Fig tree
Origin: Italian
30. Olinus
Meaning: Heir; descendant
Origin: Scandinavian
31. Omer
Meaning: Speaker; eloquent
Origin: Hebrew
32. Omid
Meaning: Hope
Origin: Persian
33. Omran
Meaning: Prosperity; development
Origin: Arabic
34. Omkar
Meaning: Sacred sound of the universe
Origin: Sanskrit
35. Omidullah
Meaning: Hope of God
Origin: Persian / Arabic
36. Omranullah
Meaning: Prosperity of God
Origin: Arabic
37. Orazio
Meaning: Timekeeper
Origin: Italian / Latin
38. Orestes
Meaning: Mountain dweller
Origin: Greek
39. Orin
Meaning: Pale green; fair
Origin: Irish
40. Orrin
Meaning: Pine tree
Origin: Irish
41. Orry
Meaning: Pale; light-colored
Origin: Irish
42. Orson
Meaning: Bear cub
Origin: Latin
43. Orton
Meaning: Settlement near the river
Origin: English
44. Orval
Meaning: Golden town
Origin: French
45. Osric
Meaning: Divine ruler
Origin: Old English
46. Oswin
Meaning: Friend of God
Origin: Old English
47. Osbourne
Meaning: Divine warrior
Origin: Old English
48. Othman
Meaning: Wise; powerful
Origin: Arabic
49. Othniel
Meaning: Strength of God
Origin: Hebrew
50. Othello
Meaning: Prosperous
Origin: Italian
51. Ottavio
Meaning: Eighth-born child
Origin: Italian
52. Ottis
Meaning: Wealth
Origin: German
53. Ottmar
Meaning: Famous wealth
Origin: German
54. Ottokar
Meaning: Wealthy warrior
Origin: German
55. Ovadia
Meaning: Servant of God
Origin: Hebrew
56. Ovid
Meaning: Sheep farmer
Origin: Latin
57. Owais
Meaning: Little wolf
Origin: Arabic
58. Ozan
Meaning: Poet; bard
Origin: Turkish
59. Ozias
Meaning: Salvation of God
Origin: Hebrew
60. Oziel
Meaning: God is my strength
Origin: Hebrew
61. Ozzy
Meaning: Divine spear
Origin: English
62. Ozair
Meaning: Helper of God
Origin: Arabic
63. Oakesh
Meaning: Lord of the oak trees
Origin: Modern English
64. Oaklan
Meaning: Oak meadow
Origin: English
65. Oaklen
Meaning: Meadow of oak trees
Origin: English
66. Oaklyn
Meaning: Lake of oak trees
Origin: English
67. Oakly
Meaning: Oak clearing
Origin: English
68. Oakson
Meaning: Son of Oak
Origin: Modern English
69. Oakton
Meaning: Oak town
Origin: English
70. Oaken
Meaning: Made of oak wood
Origin: English
71. Oaker
Meaning: Worker of oak wood
Origin: English
72. Oakford
Meaning: Oak River Crossing
Origin: English
73. Oakwell
Meaning: Oak spring
Origin: English
74. Oakwin
Meaning: Oak friend
Origin: English
75. Oakston
Meaning: Oak settlement
Origin: English
76. Obadiah
Meaning: Servant of God
Origin: Hebrew
77. Obed
Meaning: Servant; worshipper
Origin: Hebrew
78. Oberon
Meaning: Noble bear
Origin: Germanic
79. Oberto
Meaning: Bright noble
Origin: Italian
80. Obie
Meaning: Servant of God
Origin: Hebrew
81. Obi
Meaning: Heart; spirit
Origin: Igbo
82. Obinna
Meaning: Father’s heart
Origin: Igbo
83. Obasi
Meaning: In honor of God
Origin: African
84. Obedias
Meaning: Servant of God
Origin: Hebrew
85. Obidiah
Meaning: Worshipper of God
Origin: Hebrew
86. Ocasio
Meaning: Occasion
Origin: Spanish
87. Oceano
Meaning: Ocean
Origin: Italian
88. Oceanus
Meaning: Ocean; sea god
Origin: Greek
89. Ocie
Meaning: Noble
Origin: English
90. Octave
Meaning: Eighth
Origin: French
91. Octavian
Meaning: Eighth-born
Origin: Latin
92. Octavius
Meaning: Eighth
Origin: Latin
93. Octavion
Meaning: Eighth-born
Origin: Latin
94. Octaviano
Meaning: Eighth-born child
Origin: Spanish
95. Octavien
Meaning: Eighth
Origin: French
96. Octavus
Meaning: Eighth
Origin: Latin
97. Odel
Meaning: Wealthy
Origin: German
98. Odelio
Meaning: Wealthy
Origin: German
99. Odell
Meaning: Woad hill
Origin: English
100. Oden
Meaning: Inspiration; fury
Origin: Norse
101. Odhran
Meaning: Little pale one
Origin: Irish
102. Odilon
Meaning: Wealthy
Origin: French
103. Odis
Meaning: Wealth
Origin: German
104. Odysseus
Meaning: Wrathful; hero of Greek myth
Origin: Greek
105. Odyssey
Meaning: Long journey
Origin: Greek
106. Ofer
Meaning: Young deer
Origin: Hebrew
107. Ofir
Meaning: Land of gold
Origin: Hebrew
108. Ogden
Meaning: Oak Valley
Origin: English
109. Oguz
Meaning: Tribal leader
Origin: Turkish
110. Ohad
Meaning: United
Origin: Hebrew
111. Oisin
Meaning: Little deer
Origin: Irish
112. Ojani
Meaning: Strong
Origin: Spanish
113. Okafor
Meaning: Born on Afor day
Origin: Igbo
114. Okello
Meaning: Born after twins
Origin: African
115. Okoro
Meaning: Young man
Origin: African
116. Okoye
Meaning: Born on Oye day
Origin: Igbo
117. Oladele
Meaning: Honor has come home
Origin: Yoruba
118. Oladipo
Meaning: Wealth has returned
Origin: Yoruba
119. Olaitan
Meaning: Wealth never ends
Origin: Yoruba
120. Olamide
Meaning: My wealth has arrived
Origin: Yoruba
121. Olanrewaju
Meaning: Wealth moves forward
Origin: Yoruba
122. Olatunde
Meaning: Wealth has returned
Origin: Yoruba
123. Olawale
Meaning: Wealth has come home
Origin: Yoruba
124. Olawumi
Meaning: Wealth attracts me
Origin: Yoruba
125. Olumide
Meaning: My God has come
Origin: Yoruba
126. Olusegun
Meaning: God is victorious
Origin: Yoruba
127. Oluwaseun
Meaning: Thank God
Origin: Yoruba
128. Oluwatosin
Meaning: God is worthy to be praised
Origin: Yoruba
129. Oluwafemi
Meaning: God loves me
Origin: Yoruba
130. Oluwadarasimi
Meaning: God has been good to me
Origin: Yoruba
131. Oluwatobi
Meaning: God is great
Origin: Yoruba
132. Oluwaseyi
Meaning: God has done this
Origin: Yoruba
133. Oluwadamilola
Meaning: God has made me wealthy
Origin: Yoruba
134. Omani
Meaning: From Oman
Origin: Arabic
135. Omarion
Meaning: Flourishing
Origin: Arabic
136. Omerion
Meaning: Speaker
Origin: Hebrew
137. Omario
Meaning: Flourishing
Origin: Arabic
138. Omere
Meaning: Long life
Origin: Hebrew
139. Omraniel
Meaning: Prosperity of God
Origin: Arabic
140. Omir
Meaning: Prince
Origin: Arabic
141. Omelio
Meaning: Helper
Origin: Italian
142. Onan
Meaning: Strong
Origin: Hebrew
143. Onesimus
Meaning: Useful; beneficial
Origin: Greek
144. Oneal
Meaning: Champion
Origin: Irish
145. Oneil
Meaning: Champion
Origin: Irish
146. Onofrio
Meaning: Peace warrior
Origin: Italian
147. Onslow
Meaning: Enthusiastic hill
Origin: English
148. Onur
Meaning: Honor
Origin: Turkish
149. Onyeka
Meaning: Greater than God
Origin: Igbo
150. Onyebuchi
Meaning: God is the mind
Origin: Igbo
151. Onyekachi
Meaning: Who is greater than God
Origin: Igbo
152. Onyekwere
Meaning: God agreed
Origin: Igbo
153. Onyinye
Meaning: Gift
Origin: Igbo
154. Onyekael
Meaning: Strength of God
Origin: Igbo
155. Onyekwelu
Meaning: God agrees
Origin: Igbo
156. Onyekachukwu
Meaning: Who is greater than God
Origin: Igbo
157. Onyemachi
Meaning: No one knows tomorrow
Origin: Igbo
158. Onyedikachi
Meaning: Who is like God
Origin: Igbo
159. Onyekaobi
Meaning: God is in the heart
Origin: Igbo
160. Onyema
Meaning: Good spirit
Origin: Igbo
161. Onyemelukwe
Meaning: God has done well
Origin: Igbo
162. Oryan
Meaning: Heavenly light
Origin: Modern
163. Orien
Meaning: Rising sun
Origin: Latin
164. Orlan
Meaning: Famous land
Origin: French
165. Orlanzo
Meaning: Famous land
Origin: Italian
166. Orlander
Meaning: Famous land
Origin: Germanic
167. Orlondo
Meaning: Famous land
Origin: Italian
168. Orlin
Meaning: Golden town
Origin: French
169. Orlo
Meaning: Famous land
Origin: Italian
170. Orlyn
Meaning: Spear ruler
Origin: English
171. Ormand
Meaning: Spear protector
Origin: German
172. Ormond
Meaning: Spear protector
Origin: German
173. Orpheus
Meaning: Darkness of the night; mythic musician
Origin: Greek
174. Orrick
Meaning: Oak ruler
Origin: English
175. Orvaldo
Meaning: Golden town
Origin: Spanish
176. Orvin
Meaning: Friend of the army
Origin: English
177. Orwin
Meaning: Friend of the boar
Origin: English
178. Orvilleton
Meaning: Settlement of the golden town
Origin: English
179. Orenthal
Meaning: From the eastern town
Origin: English
180. Orfeo
Meaning: Darkness; mythic singer
Origin: Italian / Greek
181. Orienzo
Meaning: Rising sun
Origin: Latin
182. Orlanis
Meaning: Famous land
Origin: French
183. Orlian
Meaning: Golden town
Origin: French
184. Orland
Meaning: Famous land
Origin: Germanic
185. Orlandis
Meaning: Famous land ruler
Origin: Germanic
186. Orlinson
Meaning: Son of Orlin
Origin: English
187. Orleston
Meaning: Settlement of Orle
Origin: English
188. Orleon
Meaning: Golden lion
Origin: French
189. Orlianzo
Meaning: Famous land
Origin: Italian
190. Orlend
Meaning: Famous land
Origin: Germanic
191. Orlen
Meaning: Famous land
Origin: French
192. Orlinel
Meaning: Little golden town
Origin: French
193. Orlindo
Meaning: Fig tree
Origin: Italian
194. Orlison
Meaning: Son of Orli
Origin: English
195. Orvyn
Meaning: Brave friend
Origin: English
196. Orvion
Meaning: Rising light
Origin: Modern
197. Orvick
Meaning: Oak village
Origin: Scandinavian
198. Orvik
Meaning: Bay settlement
Origin: Scandinavian
199. Orvell
Meaning: Golden town
Origin: French
200. Orvel
Meaning: Golden town
Origin: French
201. Orvillo
Meaning: Golden settlement
Origin: Spanish
202. Orvynel
Meaning: Noble friend
Origin: English
203. Orvian
Meaning: Golden one
Origin: Latin
204. Orvander
Meaning: Brave defender
Origin: Germanic
205. Orvan
Meaning: Noble friend
Origin: English
206. Orvante
Meaning: Brave leader
Origin: Modern
207. Orvencio
Meaning: Brave warrior
Origin: Spanish
208. Orvando
Meaning: Noble protector
Origin: Spanish
209. Orviano
Meaning: Golden warrior
Origin: Italian
210. Orvado
Meaning: Brave protector
Origin: Spanish
211. Orven
Meaning: Noble friend
Origin: English
212. Orvello
Meaning: Golden town
Origin: Italian
213. Orvellis
Meaning: Golden land
Origin: French
214. Orvellon
Meaning: Great golden town
Origin: French
215. Orvent
Meaning: Noble wind
Origin: English
216. Orvinton
Meaning: Friend’s settlement
Origin: English
217. Orvickson
Meaning: Son of Orvick
Origin: English
Wrapping Up
Choosing a baby name often takes time and patience. Looking through a large list can make the process easier and more organized.
These boys’ names that start with O bring together many options with different meanings, sounds, and cultural roots.
Reading them slowly can help parents notice names that feel strong, memorable, or meaningful. Saying a few favorites out loud may also make the choice clearer.
A name becomes part of a child’s identity and will stay with them throughout life, so it deserves careful thought.
If this list of male names that start with O helped spark ideas, consider sharing it with other parents or saving it for later inspiration.
