| Name | Sex | Language | Meaning(s) | Original Spelling | Notes |
|---|
| Olive | Female | English 773 names | Meaning(s) of Olive: Olive 18 names | | |
| Oliver | Male | English 773 names | Meaning(s) of Oliver: Olive Tree 16 names | | |
| Olivia | Female | English 773 names | Meaning(s) of Olivia: Olive 18 names | | |
| Opal | Female | English 773 names | Meaning(s) of Opal: Opal 2 names | | Opal is a type of gemstone. |
| Opaline | Female | English 773 names | Meaning(s) of Opaline: Opal 2 names | | Elaboration of Opal. |
| Orson | Male | English 773 names | Meaning(s) of Orson: Bear-cub 2 names | | |
| Osborn | Male | English 773 names | Meaning(s) of Osborn: Bear of God 3 names Warrior of God 3 names | | |
| Osborne | Male | English 773 names | Meaning(s) of Osborne: Bear of God 3 names Warrior of God 3 names | | Variant of the name Osborn. |
| Osbourne | Male | English 773 names | Meaning(s) of Osbourne: Bear of God 3 names Warrior of God 3 names | | Variant of the name Osborn. |
| Oscar | Male | English 773 names Irish 84 names | Meaning(s) of Oscar: Friend of Deer 2 names | | |
| Osmond | Male | English 773 names | Meaning(s) of Osmond: Protected by God 3 names | | |
| Osmund | Male | English 773 names | Meaning(s) of Osmund: Protected by God 3 names | | Variant of the name Osmond. |
| Oswald | Male | English 773 names | Meaning(s) of Oswald: Rule of God 1 names | | |
| Oswin | Male | English 773 names | Meaning(s) of Oswin: Friend of God 3 names | | |
| Ottoline | Female | English 773 names French 120 names | Meaning(s) of Ottoline: Prosperous 78 names | | Diminutive form of Ottilie. |
| Patricia | Female | English 773 names | Meaning(s) of Patricia: Noble 277 names Patrician 4 names | | Feminine of Patrick and Patricio. |
| Patrick | Male | English 773 names Irish 84 names | Meaning(s) of Patrick: Noble 277 names Patrician 4 names | | |
| Paul | Male | English 773 names French 120 names German 170 names | Meaning(s) of Paul: Small 14 names | | |
| Paula | Female | English 773 names German 170 names | Meaning(s) of Paula: Small 14 names | | Feminine of Paul. |
| Paulene | Female | English 773 names | Meaning(s) of Paulene: Small 14 names | | Variant of Pauline. |
| Pearce | Male | English 773 names Irish 84 names | Meaning(s) of Pearce: Rock 34 names Stone 19 names | | Variant of Pierce. |
| Pearl | Female | English 773 names | Meaning(s) of Pearl: Pearl 41 names | | |
| Peregrine | Male | English 773 names | Meaning(s) of Peregrine: Foreigner 5 names Stranger 10 names | | |
| Perry | Male | English 773 names | Meaning(s) of Perry: Foreigner 5 names Stranger 10 names | | Pet form of Peregrine, or from a surname meaning "one who lives by a pear tree". |
| Persis | Female | English 773 names | Meaning(s) of Persis: Persian Woman 1 names | | Name of a woman mentioned in the New Testament. |
| Peta | Female | English 773 names | Meaning(s) of Peta: Rock 34 names Stone 19 names | | Feminine of Peter. |
| Peter | Male | English 773 names German 170 names Scandinavian 81 names | Meaning(s) of Peter: Rock 34 names Stone 19 names | | Name of one of the apostles of prophet Jesus son of Mary. |
| Petra | Female | English 773 names | Meaning(s) of Petra: Rock 34 names Stone 19 names | | Feminine of Peter. |
| Philbert | Male | English 773 names French 120 names | Meaning(s) of Philbert: Bright Love 1 names Very Bright 1 names Very Famous 1 names | | |
| Philip | Male | English 773 names | Meaning(s) of Philip: Horse-lover 8 names | | |
| Philipina | Female | English 773 names German 170 names | Meaning(s) of Philipina: Horse-lover 8 names | | Variant of the name Philippina. |
| Philippa | Female | English 773 names German 170 names | Meaning(s) of Philippa: Horse-lover 8 names | | Feminine of Philip. |
| Philippina | Female | English 773 names German 170 names | Meaning(s) of Philippina: Horse-lover 8 names | | Elaboration of Philippa. |
| Philo | Male | English 773 names German 170 names | Meaning(s) of Philo: Loving 33 names | | |
| Pia | Female | English 773 names Italian 145 names Polish 52 names Scandinavian 81 names | Meaning(s) of Pia: Honorable 53 names Pious 18 names Respectful 7 names | | From the feminine form of Latin pius. |
| Pierce | Female | English 773 names Irish 84 names | Meaning(s) of Pierce: Rock 34 names Stone 19 names | | Variant of Piers. |
| Piers | Male | English 773 names | Meaning(s) of Piers: Rock 34 names Stone 19 names | | Middle English form of Peter. |
| Poppy | Female | English 773 names | Meaning(s) of Poppy: Poppy 4 names | | |
| Primrose | Male | English 773 names | Meaning(s) of Primrose: Primrose 1 names | | |
| Prince | Male | English 773 names | Meaning(s) of Prince: Prince 5 names | | |
| Prosper | Male | English 773 names French 120 names | Meaning(s) of Prosper: Fortunate 52 names Prosperous 78 names | | From Latin Prosperus. |
| Prudence | Female | English 773 names | Meaning(s) of Prudence: Provident 3 names Prudence 1 names | | From a Latin word meaning "provident", and also used in referral to the English word. |
| Prunella | Female | English 773 names | Meaning(s) of Prunella: Prunella 1 names | | Refers to a type of plant. |
| Quentin | Male | English 773 names French 120 names | Meaning(s) of Quentin: Fifth 2 names | | |
| Quinton | Male | English 773 names | Meaning(s) of Quinton: Fifth 2 names | | Variant of Quentin. |
| Rachel | Female | English 773 names French 120 names German 170 names | Meaning(s) of Rachel: Ewe 3 names | | Name of the wife of Jacob (prophet Ya`qub), mother of Joseph (prophet Yusuf) and Benjamin. |
| Rachelle | Female | English 773 names French 120 names German 170 names | Meaning(s) of Rachelle: Ewe 3 names | | Variant of the name Rachel. |
| Raphael | Male | English 773 names French 120 names German 170 names | Meaning(s) of Raphael: God Heals 6 names | | |
| Regina | Female | English 773 names | Meaning(s) of Regina: Queen 20 names | | |
| Reid | Male | English 773 names Scottish 76 names | Meaning(s) of Reid: Red-haired 4 names Ruddy-complexioned 1 names | | |
