Starting with letter O
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 201 | Oran | Gaelic | Pale. | M | |
| 202 | Oran | Irish | Pale green. | M | |
| 203 | Oratun | English | From the shore farm. | M | |
| 204 | Orban | Latin | Born in the city. | M | |
| 205 | Orbart | German | Wealthy. | M | |
| 206 | Orbert | German | Wealthy. | M | |
| 207 | Orcus | Latin | The mythical underworld. | M | |
| 208 | Ord | Anglo-Saxon | Spear. | M | |
| 209 | Ordland | English | From the pointed hill. | M | |
| 210 | Ordman | English | Spearman. | M | |
| 211 | Ordmund | English | Spear defender. | M | |
| 212 | Ordsone | English | Ormond's son. | M | |
| 213 | Ordwald | English | Spear strength. | M | |
| 214 | Ordway | Anglo-Saxon | Warrior armed with a spear. | M | |
| 215 | Ordwin | English | Spear friend. | M | |
| 216 | Ordwine | English | Spear friend. | M | |
| 217 | Oreb | Biblical | A raven. | M | |
| 218 | Oreias | Greek | From the mountain. | M | |
| 219 | Orel | Russian | Eagle. | M | |
| 220 | Orel | Slavic | Eagle. | M | |