| Name | Meaning | Gender | Origin |
| Plato | Strong Shoulders | M | Greek |
| Platt | Ground Without Slope | E | French |
| Pleasance | Agreeable | F | French |
| Polla | poppy | F | Arabic |
| Pollux | crown | M | Greek |
| Polly | Bitter | F | Latin |
| Pollyanna | combination of Polly + Anna | F | English |
| Polo | Alligator | M | African |
| Pomeroy | apple orchard | M | French |
| Pomona | Apple | F | Greek |
| Ponce | Fifth | M | Spanish |
| Poni | second daughter | F | African |
| Pooky | Little Cute Person | E | American |
| Poppy | From the Flower | E | Latin |
| Porfirio | purple stone | M | Greek/ Spanish |
| Porsche | Offering | E | German |
| Porter | Door Guard | E | Latin |
| Portia | Offering | F | Latin |
| Posy | Small Flower | F | English |
| Powa | Wealthy | M | Native American |
| Powell | alert | M | English |
| Pramad | rejoicing | M | Hindi |
| Pravat | History | M | Thai |
| Precious | Precious one | F | American |
| Prem | Love/ Affection | M | Hindi |
| Prema | Love | F | Arabic |
| Premala | Loving | F | Hindi |
| Prentice | Beginner/ Learning | E | English |
| Presencia | Presence | F | Spanish |
| Presley | Priest's Land | E | English |
| Presta | Hurry/ quick | F | Spanish |
| Preston | Priest's Town | E | English |
| Prewitt | Brave One | M | French |
| Prima | first/ beginning; first child | F | Latin |
| Primavera | Springtime | F | Spanish |
| Primo | First Born | M | Italian |
| Prince | Royal Son | M | Latin |
| Princess | Royal Daughter | F | English |
| Prisca | Ancient/ old | F | English |
| Priscilla | Ancient | F | Latin |
| Prosper | Fortune | E | Latin |
| Prudence | Cautious/ Intelligent | F | English |
| Prue | Form of PRUDENCE | F | English |
| Prunella | Little Plum | F | Latin |
| Psyche | The Soul | F | Greek |
| Pualani | heavenly flower | F | Hawaaian |
| Pules | Pidgeon | F | Native American |
| Purity | Unsullied/ Clean | F | English |
| Purvis | providing food | M | French/ English |
| Putman | dweller by the pond | M | English |