| Pablo |
| Pacey |
| Paddy |
| Padraic |
| Padraig |
| Paedar |
| Paraic |
| Parker |
| Patrick |
| Patrik |
| Patryk |
| Paudi |
| Paudie |
| Paul |
| Paulas |
| Pauraic |
| Pauric |
| Pawan |
| Pawel |
| Peadair |
| Peadar |
| Pearce |
| Pearse |
| Perry |
| Peter |
| Phearse |
| Philip |
| Philip-junior |
| Phillip |
| Phin |
| Phoenix |
| Piaras |
| Pierce |
| Pijus |
| Piotr |
| Pj |
| Podhraig |
| Podraig |
| Pol |
| Polat |
| Porter |
| Prabhav |
| Pranav |
| Pranith |
| Presley |
| Preston |
| Preztyn |
| Prince |