| Ordbehrt | Bright, shining protector |
| Ordgar | A spearwielding guardian. |
| Ordheah | One of high spear status. |
| Ordla | A small or young spearman. |
| Ordlaf | Upright, noble descendant |
| Ordovs | Upright, noble ruler |
| Ordric | Ruler of the people |
| Orenga | A person from the gold field. |
| Oriolz | Derived from the golden bird. |
| Ormar | A famous and noble warrior. |
| Orofoise | A golden forest dweller. |
| Orped | A brave and noble soldier. |
| Orphelin | Alone, without parents |
| Orvvite | A wise and golden spirit. |
| Osbald | Divine strength |
| Osbarn | A divine warrior of bears. |
| Osbeohrt | Divine guardian |
| Osbeorn | Derived from Old Norse meaning divine bear. |
| Osbern | An Old English name meaning divine bear. |
| Osbernus | Latinized form meaning a divine bear. |
| Osbertus | Latinized name meaning divine bright. |
| Osbryht | Divine brightness |
| Oscytel | Divine protector |
| Oseberne | A variant spelling meaning divine bear. |
| Osebertus | Latinized name meaning divine bright. |
| Osegod | An Old English name meaning divine god. |
| Osewold | An Old English name meaning divine rule. |
| Osfrid | Derived from Old English, means 'divine strength' or 'gift of God' |
| Osfrith | Old English name meaning 'divine strength' or 'gift of God' |
| Osgarus | Derived from Old English, means 'divine spear' or 'spear of God' |
| Oshern | Old English name meaning 'divine lord' or 'lord of God' |
| Oslac | Derived from Old English, means 'divine ruler' or 'ruler of God' |
| Oslafa | Old English name meaning 'divine glory' or 'glory of God' |
| Osmaer | Derived from Old English, means 'divine fame' or 'fame of God' |
| Osmanek | Old English name meaning 'divine gift' or 'gift of God' |
| Osment | Derived from Old English, means 'divine protector' or 'protector of God' |
| Osmer | An Old English name meaning divine fame. |
| Osmod | Old English name meaning 'divine strength' or 'strength of God' |
| Osmon | Derived from Old English, means 'divine ruler' or 'ruler of God' |
| Osulf | Old English name meaning 'divine wolf' or 'wolf of God' |