| Name of Family or Major Holdings -A- | Place of Origin |
| Pastenaci [Oxenstierna illeg] | Sweden -> Prussia -> Poland |
| Pasternack [Oxenstierna illeg] | Sweden -> Prussia -> Poland |
| Pau [baron of; Barcelona] | Iberia |
| von Peccatel | Mecklenburg -> Sweden |
| Pembroke, Earls [Hastings] | England |
| Peralada [lord, viscount, count of; Barcelona] | Iberia |
| Peralada, Carmenco y Rocaberti [lord of; Barcelona] | Iberia |
| Counts of P�rigueux | France |
| de Perpigord | Albret* |
| Petersdorff | Denmark |
| von Pfirt | Bar* |
| Philipson-Stow | UK to Canada, SA, Australia |
| Piast (house of) | Poland |
| de Pierrepont | Bar* |
| de Pierrepont & de Nonsart | Bar* |
| Pipa | Sweden |
| Plantagenet | France |
| de Poiseye | Bar* |
| king of Poland [Piast] | Poland |
| king of Poland [Vasa] | Sweden -> Poland |
| Porse | Sweden |
| Posse | Sweden |
| Posse af Hedensund | Sweden |
| Posse af S�by | Sweden |
| Prades [count of; Barcelona] | Iberia |
| Principato [count of; Hautville] | Normandy -> Italy |
| von Prittwitz | Ascania* |
| Provence [count of; Barcelona] | Iberia |
| Puke [Bonde] | Sweden |