| Omran | عمران | Prosperous, flourishing |
| Omran | عمران | Variant of Imran, prosperous |
| Omrao | عمراؤ | Variant of Imraan, prosperous |
| Omri | عمری | Life, long-lived |
| Onays | اونیس | Variant of Anas, friend |
| Onik | اونیک | One who is unique |
| Onon | اونون | A legendary bird in Persian mythology |
| Ons | انس | Companion, friend |
| Ons | انس | Variant of Anas, friend |
| Onsi | انسی | Variant of Anas, friendly |
| Onsi | انسی | Variant of Anas, friendly |
| Onslow | انسلو | Hill of the idol |
| Onslow | انسلو | Variant of Ansley, from the pasture |
| Oraib | عریب | Fierce, lion |
| Oraib | عریب | Variant of Areeb, knowledgeable |
| Oraibi | عریبی | Variant of Areeb, knowledgeable |
| Oraibi | عریبی | Variant of Areeb, knowledgeable |
| Orang | اورنگ | Wisdom, intellect |
| Orang | اورنگ | Variant of Arang, red |
| Orbalaye | اوربالائے | Ruler, governor |
| Orhan | اورہان | Great ruler |
| Orin | اورین | Variant of Aaron, mountain of strength |
| Orjun | اورجون | Sun, radiant |
| Orjun | اورجون | Variant of Arjun, bright |
| Orkhan | اورخان | Ruler, sovereign |
| Orko | اورکو | Divine child |
| Orman | اورمان | Man of the mountains |
| Ormazd | اورمزد | God in Zoroastrianism |
| Ornob | اورنوب | Light, sunshine |
| Orush | اورش | Sky, heaven |
| Orz | اورز | Courage, bravery |
| Orz | اورز | Variant of Orzan, brave |
| Osaf | اوصاف | Attributes, qualities |
| Osaid | اوسید | Lion, brave |
| Osama | اسامہ | Lion, brave |
| Osama | اسامہ | Variant of Usama, lion |
| Osamaa | اسامہ | Variant of Usama, lion |
| Osamaa | اسامہ | Lion, brave |
| Osman | عثمان | Variant of Uthman, wise |
| Osmanek | عثمانک | Little Uthman, little wise |
| Osmar | عثمار | Variant of Uthman, wise |
| Osmen | عثمان | Variant of Uthman, wise |
| Ossa | عصا | Helper, supporter |
| Ossama | أسامة | Variant of Osama, lion |
| Ossama | أسامة | Lion, brave |
| Ossamah | أسامہ | Variant of Usama, lion |
| Ossi | اوسی | Variant of Usama, lion |
| Osul | اوسل | Lion, brave |
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