Starting with letter O
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 81 | Oengus | Irish | One vigor. | M | |
| 82 | Oenomaus | Greek | Son of Ares. | M | |
| 83 | Oetavian | Latin | Born eighth. | M | |
| 84 | Ofer | Hebrew | Fawn. | M | |
| 85 | Offa | Anglo-Saxon | Name of a king. | M | |
| 86 | Ofydd | Welsh | Welsh form of Ovid 'a Roman poet'. | M | |
| 87 | Og | Biblical | A cake, bread baked in ashes. | M | |
| 88 | Ogaleesha | NativeAmerican | Wears a red shirt (Sioux). | M | |
| 89 | Ogden | English | From the oak tree valley. | M | |
| 90 | Ogdon | English | From the oak tree valley. | M | |
| 91 | Ogelsby | English | Fearsome. | M | |
| 92 | Ogelsvie | English | Fearsome. | M | |
| 93 | Ogelsvy | English | Fearsome. | M | |
| 94 | Ogilhinn | Scottish | From the high peak. | M | |
| 95 | Ogilvie | Scottish | From the high peak. | M | |
| 96 | Ohad | Biblical | Praising, confessing. | M | |
| 97 | Ohanko | NativeAmerican | Reckless. | M | |
| 98 | Ohanzee | NativeAmerican | Shadow (Sioux). | M | |
| 99 | Ohcumgache | NativeAmerican | Little wolf (Cheyenne). | M | |
| 100 | Ohel | Biblical | Tent, tabernacle, brightness. | M | |