Boy Baby Names - O
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| NAME | ORIGIN | MEANING |
| Oedipus | Greek | Swollen foot. |
| Oegelsby | English | Fearsome. |
| Oeneus | Greek | King of Calydon. |
| Oengus | Irish | One vigor. |
| Oenomaus | Greek | Son of Ares. |
| Oetavian | Latin | Born eighth. |
| Ofer | Hebrew | Fawn. |
| Offa | Anglo-Saxon | Name of a king. |
| Ofydd | Welsh | Welsh form of Ovid 'a Roman poet'. |
| Og | Biblical | A cake, bread baked in ashes. |
| Ogaleesha | Native American | Wears a red shirt (Sioux). |
| Ogden | Old-English | from the oak valley |
| Ogdon | English | From the oak tree valley. |
| Ogelsby | English | Fearsome. |
| Ogelsvie | English | Fearsome. |
| Ogelsvy | English | Fearsome. |
| Ogilhinn | Scottish | From the high peak. |
| Ogilvie | Scottish | From the high peak. |
| Ogilvy | Old Scottish | from the high peak |
| Oguz | Hungarian | arrow |
| Ohad | Biblical | Praising, confessing. |
| Ohanko | Native American | Reckless. |
| Ohanzee | Native-American | Shadow |
| Ohcumgache | Native American | Little wolf (Cheyenne). |
| Ohel | Biblical | Tent, tabernacle, brightness. |
| Ohitekah | Native American | Brave (Sioux). |
| Oidhche | Scottish | Night. |
| Oilibhear | Norse | Relic. |
| Oistin | Latin | Revered. |
| Okes | English | From the oak. |
