| Name | Sex | Language | Meaning(s) | Original Spelling | Notes |
|---|
| Odaina | Male | Arabic 10801 names | Meaning(s) of Odaina: Listener 7 names Obedient 25 names | عُدينة | Variant of the name Uzaina. |
| Oday | Male | Arabic 10801 names | Meaning(s) of Oday: Warrior 62 names | عُدَيّ | Variant of the name Udai. |
| Odayna | Male | Arabic 10801 names | Meaning(s) of Odayna: Listener 7 names Obedient 25 names | عُدينة | Variant of the name Uzaina. |
| Ohdawi | Male | Arabic 10801 names | Meaning(s) of Ohdawi: Guardian 56 names Protector 69 names | عُهْدَويّ | Variant of the name Uhdawi. |
| Ohud | Male | Arabic 10801 names | Historic name with unknown meaning. | أُحُد | Variant of the name Uhud. |
| Okko | Male | Finnish 22 names | Meaning(s) of Okko: Friend of Deer 2 names | | |
| Oktai | Male | Turkish 166 names | Meaning(s) of Oktai: Elite 16 names Famous 27 names | اُكتاي | |
| Oleg | Male | Russian 86 names | Meaning(s) of Oleg: Prosperous 78 names Successful 158 names | | |
| Oleksander | Male | Ukrainian 2 names | Meaning(s) of Oleksander: Defender of Humanity 37 names | | Form of Alexander. |
| Oliver | Male | English 773 names | Meaning(s) of Oliver: Olive Tree 16 names | | |
| Omaijed | Male | Arabic 10801 names | Meaning(s) of Omaijed: Glorious 24 names Majestic 46 names | أُمَيْجِد | Variant of the name Umaijid. |
| Omaijid | Male | Arabic 10801 names | Meaning(s) of Omaijid: Glorious 24 names Noble 277 names Praiseworthy 107 names | أُمَيْجِد | |
| Omaizar | Male | Arabic 10801 names | Meaning(s) of Omaizar: Strong 97 names | أُمَيْزار | Variant of the name Umaizar. |
| Omar | Male | Arabic 10801 names | Meaning(s) of Omar: Life 42 names Long-lived 46 names | عُمر | Variant of the name Umar. |
| Omayr | Male | Arabic 10801 names | Meaning(s) of Omayr: Life 42 names Long-lived 46 names | عُمير | Variant of the name Umair. |
| Omer | Male | Arabic 10801 names | Meaning(s) of Omer: Life 42 names Long-lived 46 names | عُمر | Variant of the name Umar. |
| Omidvar | Male | Persian 2045 names | Meaning(s) of Omidvar: Hopeful 1 names | اميدوار | |
| Onais | Male | Arabic 10801 names | Meaning(s) of Onais: Consoler 33 names Good Friend 15 names | أُنَيْس | Variant of the name Onays. |
| Onays | Male | Arabic 10801 names | Meaning(s) of Onays: Consoler 33 names Good Friend 15 names | أُنَيْس | |
| Ons | Male | Arabic 10801 names | Meaning(s) of Ons: Gladness 5 names | أَنِس | |
| Onsi | Male | Arabic 10801 names | Meaning(s) of Onsi: Bringer of Calm and Gladness 4 names | أُنْسِي | |
| Oraib | Unisex | Arabic 10801 names | Meaning(s) of Oraib: Intelligent 181 names Keen 24 names Perceptive 68 names | أُرَيْب | |
| Oraibi | Male | Arabic 10801 names | Meaning(s) of Oraibi: Intelligent 181 names Keen 24 names Perceptive 68 names | أُرَيْبِي | |
| Orang | Male | Persian 2045 names | Meaning(s) of Orang: Throne 4 names | اورنگ | |
| Orell | Male | Swiss 2 names | Meaning(s) of Orell: Golden 17 names | | Form of Aurelius. |
| Orhaan | Male | Turkish 166 names | Meaning(s) of Orhaan: Great Leader 4 names | | Variant of the name Orhan. |
| Orhan | Male | Turkish 166 names | Meaning(s) of Orhan: Great Leader 4 names | | |
| Orkhaan | Male | Turkish 166 names | Meaning(s) of Orkhaan: Great Leader 4 names | أُوْرْخان | Variant of the name Orkhan. |
| Orkhan | Male | Turkish 166 names | Meaning(s) of Orkhan: Great Leader 4 names | أُوْرْخان | |
| Orlando | Male | Italian 145 names | Meaning(s) of Orlando: Famous Land 5 names | | Italian form of Roland. |
| Orson | Male | English 773 names | Meaning(s) of Orson: Bear-cub 2 names | | |
| Orwa | Unisex | Arabic 10801 names | Meaning(s) of Orwa: Ever-green Tree 4 names Handhold 4 names Lion 105 names | عُروة | Variant of the name Urwah, which is mentioned in the Quran. |
| Orwah | Unisex | Arabic 10801 names | Meaning(s) of Orwah: Ever-green Tree 4 names Handhold 4 names Lion 105 names | عُروة | Variant of the name Urwah, which is mentioned in the Quran. |
| Orz | Male | Arabic 10801 names | Meaning(s) of Orz: Proximity 4 names Side 5 names | عُرْض | |
| Osaim | Male | Arabic 10801 names | Meaning(s) of Osaim: Guardian 56 names Protector 69 names Refuge 11 names | عُصيم | Variant of the name Usaim. |
| Osaym | Male | Arabic 10801 names | Meaning(s) of Osaym: Guardian 56 names Protector 69 names Refuge 11 names | عُصيم | Variant of the name Usaim. |
| Osborn | Male | English 773 names | Meaning(s) of Osborn: Bear of God 3 names Warrior of God 3 names | | |
| Osborne | Male | English 773 names | Meaning(s) of Osborne: Bear of God 3 names Warrior of God 3 names | | Variant of the name Osborn. |
| Osbourne | Male | English 773 names | Meaning(s) of Osbourne: Bear of God 3 names Warrior of God 3 names | | Variant of the name Osborn. |
| Oscar | Male | English 773 names Irish 84 names | Meaning(s) of Oscar: Friend of Deer 2 names | | |
| Osheen | Male | Irish 84 names | Meaning(s) of Osheen: Little Deer 1 names | | |
| Osip | Male | Russian 86 names | Meaning(s) of Osip: (God) Shall Add (Another Son) 1 names | | Form of Joseph. |
| Osmond | Male | English 773 names | Meaning(s) of Osmond: Protected by God 3 names | | |
| Osmund | Male | English 773 names | Meaning(s) of Osmund: Protected by God 3 names | | Variant of the name Osmond. |
| Oswald | Male | English 773 names | Meaning(s) of Oswald: Rule of God 1 names | | |
| Oswin | Male | English 773 names | Meaning(s) of Oswin: Friend of God 3 names | | |
| Ottavio | Male | Italian 145 names | Meaning(s) of Ottavio: Eighth 3 names | | Form of Octavius. |
| Otto | Male | German 170 names | Meaning(s) of Otto: Prosperous 78 names | | |
| Ovadia | Male | Jewish 12 names | Meaning(s) of Ovadia: Servant of God 231 names | | Modern Hebrew form of Obadiah. |
| Owaib | Male | Arabic 10801 names | Meaning(s) of Owaib: Repentant 34 names | أُوَيْب | |
