| Name | Meaning |
| • Oakes | Oak Trees |
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| • Oakley | Oak-tree Field |
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| • Obed | A Short Form Of Obadiah |
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| • Ogden | Oak Valley. |
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| • Ohm | |
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| • Oj | Light, Power |
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| • Ojal | Scene |
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| • Ojas | Vitality |
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| • Ojas | Light |
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| • Ojasvi | Famed, Brave |
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| • Ojayit | Courageous |
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| • okendra | Saffron |
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| • Olin | Holly |
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| • Ollie | A Familiar Form Of Oliver |
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| • Om | Primordial sound |
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| • Om | Omkar |
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| • Om Kumar | Son of God |
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| • Om Prakash | Divine Light |
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| • Om Pratap | Power of Om |
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| • Om Swaroop | Marvellous |
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| • Omaha | A person in great joy, rapture |
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| • Omair | Problem solver |
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| • Omar | Long life, first son, most high, the Prophet's follower |
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| • Omdutt | Given by God |
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| • Omeir | Long living |
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| • Omesh | Lord of the Om |
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| • Omeshwar | Lord of the Om |
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| • Omkaar | |
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| • Omkar | Religious word OM |
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| • Omkarnath | Lord Shiva |
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| • Ompal | God indicating word |
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| • Ompati | Master of Om |
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| • Omprakaash | |
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| • Omprakash | Sacred light |
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| • Ompuri | |
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| • Omran | Solid structure |
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| • Omran | Solid structure |
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| • Onkar | The Primal Being |
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| • Onkar | God indicating word |
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| • Onkarnath | One of 12 Shivlingams |
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| • Onslow | Enthusiast's Hill |
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| • OppilaMani | Peerless Gem |
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| • Oppilan | Peerless Gem |
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| • Ori | Name of a Charitable King |
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| • Ormond | Bear Mountain; Spear Protector |
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| • Orrick | Old Oak Tree |
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| • Orrin | River |
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| • Orton | Shore Town |
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| • Orval | A Form Of Orville |
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| • Orvin | Spear Friend |
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| • Osbert | Divine; Bright |
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| • Osborn | Warrior Of God |
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| • Osgood | Divinely Good |
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| • Osho | Dear |
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| • Osmar | Divine; Wonderful |
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| • Osmond | Divine Protector. |
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| • Osric | Divine Ruler |
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| • Ossama | One of the names of the lion. |
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| • Oswald | God's Power; God's Crest |
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| • Oswin | Divine Friend. |
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| • OttaKoothan | Name of a Poet |
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| • Ouchitya | Postion of rightness |
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| • Oujasya | Full with power |
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| • Ouraj | Son |
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| • Oushig | Born of evening |
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| • Outathya | Philosopher, Intelligent |
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| • Overton | High Town |
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| • Oviyan | Artist |
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| • Oxford | Place Where Oxen Cross The River |
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| • Oxley | Ox Meadow |
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| • Oxton | Ox Town |
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| • Ozzie | A Familiar Form Of Osborn |
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| • Ozzy | A Familiar Form Of Osborn |
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