| Athelmod | Old English, meaning 'noble moderation' or 'noble balance' |
| Oswall | Rule of God; Divine Power |
| Oswinus | Latin origin, meaning 'divine friend' or 'friend of God' |
| Oswold | Rule of God; Divine Power |
| Oswudu | Old English, meaning 'divine wood' or 'wood of God' |
| Oswuff | Old English, possibly meaning 'divine wolf' or 'wolf of God' |
| Oswulf | Means divine wolf in English. |
| Osyth | Old English, meaning 'divine strength' or 'strong in God' |
| Otta | Means wealthy or prosperous. |
| Ottewell | Old English, meaning 'brave well' or 'strong well' |
| Otuel | Old English, meaning 'brave people' or 'strong tribe' |
| Oudoceus | Latin origin, meaning 'good news' or 'joyful tidings' |
| Ouein | Greek origin, meaning 'good' or 'beautiful' |
| Oughtred | Old English, meaning 'brave counsel' or 'strong advice' |
| Owaine | Youth; Lamb; Yahweh is Gracious |
| Oxforde | Place name origin, meaning 'ox ford' or 'ford of oxen' |
| Ozwell | Old English, possibly meaning 'divine well' or 'well of God' |
| Pacca | Latin origin, meaning 'peace' or 'tranquility' |
| Pacy | Old English, possibly meaning 'peaceful' or 'tranquil' |
| Paecc | Latin origin, meaning 'peace' or 'reconciliation' |
| Paecca | From the Latin 'paecca,' meaning 'five' or 'fifth.' |
| Paeccel | Derived from the Latin 'paeccel,' meaning 'to atone' or 'to make amends.' |
| Paecga | Possibly derived from the Old English 'paecga,' meaning 'peace' or 'truce.' |
| Paegna | From the Old English 'paegna,' meaning 'pledge' or 'guarantee.' |
| Paelli | Possibly derived from the Old English 'paelli,' meaning 'peaceful' or 'tranquil.' |
| Paetta | Derived from the Old English 'paetta,' meaning 'peace' or 'truce.' |
| Paettel | Possibly derived from the Old English 'paettel,' meaning 'peaceful' or 'tranquil.' |
| Paetti | From the Old English 'paetti,' meaning 'pledge' or 'guarantee.' |
| Paga | Derived from the Latin 'paga,' meaning 'payment' or 'wages.' |
| Palamides | Derived from the Greek 'Palamides,' meaning 'defender of all.' |
| Palloc | Possibly derived from the Old English 'palloc,' meaning 'peace' or 'truce.' |
| Palm | A Pilgrim Bearing Palms |
| Palomides | Derived from the Greek 'Palamides,' meaning 'defender of all.' |
| Pandragon | Derived from the Greek 'Pandragon,' meaning 'all dragon.' |
| Pantelion | Derived from the Greek 'Pantelion,' meaning 'all lion.' |
| Parkker | Possibly derived from the Old English 'parkker,' meaning 'park keeper.' |
| Parzival | Hard; One who Pierces the Valley |
| Paschall | Derived from the Old English 'Paschall,' meaning 'Easter festival.' |
| Pash | A name meaning a deep passion. |
| Pasquere | Possibly derived from the Old English 'pasquere,' meaning 'Easter' or 'Passover.' |