Starting with letter O
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 361 | Ostein | Norse | Happy. | M | |
| 362 | Osten | Norse | Happy. | M | |
| 363 | Osvald | Teutonic | Divine power. | M | |
| 364 | Osvif | Norse | Father of Gudrun. | M | |
| 365 | Oswald | Anglo-Saxon | Name of a king. | M | |
| 366 | Oswald | English | Divine power. | M | |
| 367 | Oswald | German | Power of God. | M | |
| 368 | Oswald | Shakespearean | 'Tragedy of King Lear' Steward to Goneril. | M | |
| 369 | Oswald | Teutonic | Divine power. | M | |
| 370 | Oswaldo | Teutonic | Divine power. | M | |
| 371 | Oswallt | Welsh | Welsh form of Oswald 'strength from God'. | M | |
| 372 | Osweald | English | Divinely powerful. | M | |
| 373 | Oswell | English | Divinely powerful. | M | |
| 374 | Oswin | English | Divine friend; God's friend. | M | |
| 375 | Oswin | Scandinavian | God's friend. | M | |
| 376 | Oswine | Anglo-Saxon | Name of a king. | M | |
| 377 | Oswiu | Anglo-Saxon | Name of a king. | M | |
| 378 | Oswy | Anglo-Saxon | Name of a king. | M | |
| 379 | Oszkar | Hungarian | Hungarian form of Oscar 'leaping warrior'. | M | |
| 380 | Ota | Teutonic | Rich. | M | |