| N | 330 |
| Nabal | 13 |
| Nabarro | 16 |
| Nabas | 2 |
| Nadal | 1 |
| Nagori | 1 |
| Nahariz | 9 |
| Napal | 1 |
| Napoles | 3 |
| Narvariz | 40 |
| Narvaez | 7 |
| Narvaiz | 1 |
| Natival | 1 |
| Naudin | 2 |
| Navad | 1 |
| Naval | 17 |
| Navallas | 102 |
| Navardun | 4 |
| Navara | 1 |
| Navarro | 23 |
| Navas | 6 |
| Navascues | 62 |
| Navaz | 1 |
| Necot | 2 |
| Negro | 1 |
| Nicolas | 3 |
| Nicuesa | 8 |
| Noain | 6 |
| Noallas | 5 |
| Noballas | 2 |
| Noguera | 2 |
| Novallas | 2 |
| Nuñez | 2 |
| Obal | 1 |
| Obanos | 52 |
| Obi | 1 |
| Obieto | 2 |
| Ocaña | 1 |
| Ocariz | 6 |
| Ocos | 3 |
| Octayola | 1 |
| Octavio | 21 |
| Ochagavia | 2 |
| Ochave | 1 |
| Ochoa | 12 |
| Ochogavia | 1 |
| Ochotorena | 10 |
| Oiz | 1 |
| Oiza | 7 |
| Ojer | 84 |
| Olaberri | 2 |
| Olaechea | 7 |
| Olagüe | 9 |
| Olalquiaga | 12 |
| Olaro | 1 |
| Olastegui | 1 |
| Olave | 1 |
| Olaverri | 28 |
| Olaz | 12 |
| Olid | 1 |
| Oliveros | 14 |
| Oliverriz | 1 |
| Olza | 1 |
| Olleta | 79 |
| Ollo | 2 |
| Olloqui | 2 |
| Olloza | 2 |
| Oñate | 8 |
| Onaya | 1 |
| Onco | 5 |
| Ondarza | 1 |
| Ongay | 13 |
| Ongoz | 2 |
| Onsalo | 1 |
| Ontin | 9 |
| Oquia | 14 |
| Orbaiz | 6 |
| Orbañanos | 1 |
| Orbara | 13 |
| Ordoñez | 1 |
| Ordoqui | 47 |
| Orduna | 72 |
| Oriebat | 1 |
| Oriz | 1 |
| Oronoz | 72 |
| Oronz | 2 |
| Oros | 7 |
| Oroz | 58 |
| Orradre | 2 |
| Ortabe | 2 |
| Ortega | 10 |
| Ortigosa | 2 |
| Ortiz | 95 |
| Orzanco | 10 |
| Osacar | 8 |
| Oscariz | 7 |
| Oses | 24 |
| Oset | 77 |
| Osia | 1 |
| Osma | 1 |
| Osta | 3 |
| Ostariz | 5 |
| Ostiz | 43 |
| Otal | 6 |
| Otazu | 2 |
| Oteiza | 6 |
| Otin | 103 |
| Oyaga | 55 |
| Oyampe | 3 |
| Ozcariz | 41 |
| Ozcoidi | 238 |
| Ozcoiti | 4 |
| Oztabal | 3 |
| Oztariz | 1 |
| Pablo de | 1 |
| Pabola | 1 |
| Pabolleta | 13 |
| Pajuelo | 1 |
| Palacin | 9 |
| Palacios | 11 |
| Palomino | 1 |
| Pardo | 14 |
| Parejo | 1 |
| Parello | 1 |
| Pargada | 13 |
| Paris | 34 |
| Paroz | 6 |
| Parra | 1 |
| Pascual | 45 |
| Pascualena | 1 |
| Pastor | 7 |
| Pedraza | 2 |
| Pedrera | 6 |
| Pedrero | 1 |
| Pedruelo | 1 |
| Peiran | 15 |
| Peire | 5 |
| Peiro | 1 |
| Pejon | 16 |
| Pelegrin | 5 |
| Peloa | 46 |
| Pellejero | 1 |
| Peman | 14 |
| Peña | 67 |
| Peñaranda | 1 |
| Peralta | 32 |
| Perez | 578 |
| Perez Gil | 1 |
| Perona | 1 |
| Petrineta | 35 |
| Peyre | 21 |
| Pina | 1 |
| Pindo | 4 |
| Pinilla | 1 |
| Pinot | 1 |
| Pintado | 13 |
| Pintaner | 16 |
| Pintano | 1 |
| Pintor | 13 |
| Piquet | 1 |
| Placencia | 1 |
| Plasencia | 1 |
| Plano | 232 |
| Planzon | 44 |
| Plasencia | 8 |
| Plaza | 12 |
| Polite | 16 |
| Polo | 3 |
| Pomares | 1 |
| Pontrubel | 7 |
| Porpuente | 17 |
| Porras | 1 |
| Portatiu | 1 |
| Portillo | 5 |
| Poyo | 1 |
| Poza | 4 |
| Prado | 2 |
| Prat | 1 |
| Preciado | 1 |
| Prieto | 10 |
| Primicia | 4 |
| Primo | 1 |
| Prosin | 1 |
| Puerta de la | 1 |
| Puerto | 1 |
| Pueyo | 39 |
| Puy | 1 |
| Puyada | 101 |
| Puyano | 1 |
| Puyates | 1 |
| Puyol | 2 |
| Puzol | 3 |
| Quesada | 1 |
| Quiñones | 1 |
| Quinquillar | 8 |
| Quintana | 56 |
| Rabillero | 1 |
| Racas | 1 |
| Rada | 104 |
| Ragut | 3 |
| Ramirez | 21 |
| Ramon | 8 |
| Ramos | 5 |
| Ran | 1 |
| Rande | 2 |
Rapun |
10 |
| Raquet | 1 |
| Razquin | 17 |
| Real | 9 |
| Rebes | 1 |
| Rebole | 21 |
| Rebolta | 4 |
| Reca | 13 |
| Recalde | 5 |
| Recarte | 3 |
| Redin | 62 |
| Redondo | 4 |
| Regla | 2 |
| Remirez | 4 |
| Remon | 65 |
| Remundegui | 3 |
| Requena | 1 |
| Resa | 1 |
| Resano | 5 |
| Reta | 78 |
| Revilla | 1 |
| Revolta | 4 |
| Revuelta | 1 |
| Rey | 7 |
| Rezavir | 1 |
| Ribas | 9 |
| Ribed | 5 |
| Ribera | 3 |
| Ricarte | 16 |
| Rico | 1 |
| Ricon | 1 |
| Rios | 52 |
| Ripa | 8 |
| Ripalda | 88 |
| Ripodas | 33 |
| Rivera | 2 |
| Roa | 1 |
| Rocafort | 49 |
| Rocaforte | 113 |
| Roche La | 1 |
| Rodrigo | 59 |
| Rodriguez | 94 |
| Roget | 1 |
| Roja | 2 |
| Roman | 3 |
| Romano | 4 |
| Romanos | 3 |
| Romeo | 9 |
| Roncal | 23 |
| Roncales | 18 |
| Roque | 1 |
| Ros | 6 |
| Rosa De La | 1 |
| Rosados | 1 |
| Rosano | 1 |
| Rosanz | 6 |
| Rosas | 11 |
| Roto | 2 |
| Royo | 102 |
| Roza | 1 |
| Rua | 1 |
| Rubio | 10 |
| Ruesta | 4 |
| Rufia | 8 |
| Rugla La | 1 |
| Ruiz | 253 |
