names starting: O
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| Name | Meaning | |
| Ormemund, ormund, ordmund | Spear-defender... | More... |
| Orrick, orik, orick, orri | From the ancient oak tree... | More... |
| Orson, orsen, ordsone | Ormond's son... | More... |
| Orton, ortun, oratun | From the shore farm... | More... |
| Orval, orvil, orville, or | Spear-strength... | More... |
| Orvin, orvyn, ordwin, ord | Spear-friend... | More... |
| Os, oz | Divine... | More... |
| Osbert, osburt, osbart, o | Divinely brilliant... | More... |
| Osborn, osburn, osbourne, | Divine warrior... | More... |
| Osmar, osmarr | Divinely glorious... | More... |
| Osmond, osmund, osmont | Divine protector... | More... |
| Osred, osrid, osryd, osra | Divine counselor... | More... |
| Osric, osrik, osrick | Divine ruler... | More... |
| Oswald, osweald, oswell | Divinely powerful... | More... |
| Oxford, oxnaford | From the ox ford... | More... |
| Oxley, oxnaleah | From the ox enclosure... | More... |
| Oxton, oxnatun | From the ox farm... | More... |
| Oskari | Leaping warrior... | More... |
| Octave | Born eighth... | More... |
| Odo | Name of a bishop... | More... |
| Ogier | Legend name... | More... |
| Oliver | Legend name... | More... |
| Olivier | From the olive tree... | More... |
| Onfroi | Peaceful Hun... | More... |
| Orson, ourson | Little bear... | More... |
| Orville | From the gold town... | More... |
| Odharnait, oran, odran, | Pale... | More... |
| Orbert, odbert, orbart, o | Wealthy... | More... |
| Oswald | Power of God... | More... |
| Othman, otto, otho, othma | Wealthy... | More... |
| Otto | Born eighth... | More... |
| Ottokar | Happy fighter... | More... |
| Obiareus | Myth name (a Titan)... | More... |
| Oceanus | Myth name (father of the Oceanids)... | More... |
| Ocnus | Incompetent... | More... |
| Odysseus | Wrathful... | More... |
| Oedipus | Swollen foot... | More... |
| Oeneus | Myth name (king of Calydon)... | More... |
| Oenomaus | Myth name (son of Ares)... | More... |
| Oighrig | Well-spoken... | More... |
| Oles | Defender of man... | More... |
| Ophelos | Profit; help... | More... |
| Ophion | Myth name (a serpent)... | More... |
| Orestes, oreste, oreias | From the mountain... | More... |
| Orion | Son of fire... | More... |
| Orpheus | Myth name (son of Apollo)... | More... |
| Orthros | Myth name (guardian of Geryon)... | More... |
| Otis, otos, otus | Keen of hearing... | More... |
| Owen | Well-born... | More... |
| Oke | A form of Oscar; divine strength... | More... |
| Obadiah, ovadiah, ovadya, | Serves God... | More... |
| Oded | Encourages... | More... |
| Ofer | Fawn... | More... |
| Ophir | Meaning unknown... | More... |
| Oren, orin, oris | Tree... | More... |
| Ori, orneet, ornet | My light... | More... |
| Osip | God will multiply... | More... |
| Oved, ovid | Worker... | More... |
| Ozi, ozzie, ozzi | Strong... | More... |
| Oszkar | Hungarian form of Oscar (leaping warrior... | More... |
| Ohtli | Unisexual name meaning "road."... | More... |
| Ollin | Movement... | More... |
| Ocumwhowurst, ocunnowhurs | Cheyenne name meaning " yellow wolf... | More... |
| Odakota | Sioux name meaning " friend."... | More... |
| Ogaleesha | Sioux name meaning " wears a red s... | More... |
| Ohanko | Reckless OHANZEE... | More... |
| Ohcumgache, okhmhaka | Cheyenne name meaning " little wolf... | More... |
| Omawnakw | Hopi name meaning " cloud feather.&... | More... |
| Otaktay | Sioux name meaning " kills many.&q... | More... |
| Otoahhastis | Cheyenne name meaning " tall bull.&... | More... |
| Oya | Miwok name.Meaning unknown... | More... |
| Odd | Point ODDLEIF... | More... |
| Octavian | Eighth... | More... |
| Ovidiu | Worker... | More... |
| Onan | Prosperous... | More... |
| Onur | Honor... | More... |
| Ozturk | Pure... | More... |