| Sabalza | 210 |
| Sabio | 25 |
| Sada | 33 |
| Saenz | 1 |
| Sagardoy | 4 |
| Sagarra | 2 |
| Sagasti | 2 |
| Sagües | 23 |
| Sainz | 1 |
| Sala | 1 |
| Salas | 4 |
| Salboch | 1 |
| Salcedo | 44 |
| Sales | 1 |
| Salinas | 20 |
| Salsamendi | 2 |
| Salvador | 56 |
| Salvatierra | 7 |
| Salvide | 3 |
| Salvo | 37 |
| Salvoch | 2 |
| Samaniego | 9 |
| Samarzal | 2 |
| Samatan | 15 |
| Samitiel | 3 |
| Samitier | 18 |
| Sampelai | 1 |
| Samper | 3 |
| San ... | 269 |
| Sanchez | 337 |
| Sancho | 10 |
| Sandua | 1 |
| Sangariz | 35 |
| Sangorrin | 11 |
| Sangüesa | 1 |
| Sangurrin | 3 |
| Sanso | 28 |
| Santa Engracia | 1 |
| Santander | 2 |
| Santesteban | 4 |
| Santiago | 2 |
| Santos | 1 |
| Sanz | 474 |
| Sanzol | 33 |
| Sara | 3 |
| Saralegui | 4 |
| Sarasa | 77 |
| Sarasate | 5 |
| Sarasibar | 14 |
| Sarasti | 1 |
| Sario | 2 |
| Sariqueta | 5 |
| Sarramiana | 9 |
| Sarria | 3 |
| Sarrias | 1 |
| Sarries | 4 |
| Sarriquieta | 1 |
| Sarvide | 26 |
| Sasal | 84 |
| Sastre | 1 |
| Satrustegui | 4 |
| Schismer | 1 |
| Segura | 5 |
| Senau | 1 |
| Senito | 1 |
| Senosiain | 5 |
| Senti | 16 |
| Serra | 1 |
| Serrador | 1 |
| Serrano | 10 |
| Sesma | 3 |
| Setuain | 4 |
| Sevilla | 6 |
| Sigües | 1 |
| Silva | 6 |
| Simon | 2 |
| Sinto | 2 |
| Sinues | 12 |
| Siso | 1 |
| Sola | 265 |
| Solana | 4 |
| Solano | 1 |
| Solies | 4 |
| Somallas | 6 |
| Somojon | 2 |
| Soria | 30 |
| Sos | 36 |
| Soteras | 47 |
| Sotes | 11 |
| Soto | 144 |
| Subiran | 15 |
| Subiza | 17 |
| Suylos ? | 1 |
| S.Vicente | 2 |
| Tabar | 26 |
| Taboada | 107 |
| Tafalla | 29 |
| Taguadas | 1 |
| Tajonar | 1 |
| Tarazona | 2 |
| Tardio | 1 |
| Tebre | 1 |
| Tejada | 3 |
| Tejedor | 2 |
| Tejero | 2 |
| Telechea | 17 |
| Terron | 1 |
| Tesa | 1 |
| Texeira | 1 |
| Teza | 1 |
| Theus | 2 |
| Tiberio | 1 |
| Tiebas | 11 |
| Todoli | 2 |
| Tolosa | 3 |
| Tomas | 3 |
| Tornamira | 3 |
| Torrea | 71 |
| Torrendaco | 1 |
| Torres | 106 |
| Traza | 1 |
| Trazas | 1 |
| Tressacos | 2 |
| Trincado | 1 |
| Tripola | 11 |
| Tristan | 1 |
| Triveris | 1 |
| Troncon | 1 |
| Tudela | 3 |
| Turrillas | 11 |
| Uarte | 3 |
| Ubal | 1 |
| Ubalde | 1 |
| Ubieto | 15 |
| Ugalde | 14 |
| Ugar | 1 |
| Ugarte | 4 |
| Ugel | 1 |
| Ujue | 18 |
| Ularburu | 2 |
| Uli | 26 |
| Ulibarri | 4 |
| Unciti | 8 |
| Undiano | 21 |
| Undues | 4 |
| Unzue | 40 |
| Urabayen | 2 |
| Urban | 1 |
| Urbelz | 3 |
| Urbicain | 14 |
| Urdaci | 1 |
| Urdin ? | 1 |
| Urega ? | 1 |
| Ureta | 5 |
| Urgot | 1 |
| Uribarri | 3 |
| Urien | 1 |
| Urio | 1 |
| Uriz | 111 |
| Urniza | 1 |
| Uroz | 112 |
| Urquia | 7 |
| Urra | 2 |
| Urralburu | 1 |
| Urriaga | 4 |
| Urricelqui | 29 |
| Urries | 10 |
| Urriza | 11 |
| Urrizalqui | 7 |
| Urrizola | 100 |
| Urroz | 23 |
| Urrutia | 27 |
| Urtaso | 1 |
| Urtasun | 26 |
| Urrun | 5 |
| Uruen ? | 1 |
| Urzainqui | 3 |
| Urzaiz | 4 |
| Urzay | 1 |
| Usac | 2 |
| Uscarres | 12 |
| Usieto | 6 |
| Usoz | 77 |
| Ustariz | 17 |
| Ustarriz | 1 |
| Ustarroz | 16 |
| Ustes | 8 |
| Usumbiaga | 2 |
| Usun | 31 |
| Ustarroz | 1 |
| Val | 31 |
| Valdes | 6 |
| Valdivieso | 1 |
| Valen | 11 |
| Valencia | 39 |
| Valet | 6 |
| Vallarin | 1 |
| Vallaz | 9 |
| Vallearena | 1 |
| Vallejos | 15 |
| Varon | 1 |
| Vas | 1 |
| Vazquez | 7 |
| Velasain | 2 |
| Velasco | 7 |
| Ventura | 18 |
| Vera | 3 |
| Verdaguer | 8 |
| Verdolet | 1 |
| Verdun | 4 |
| Vergara | 10 |
| Verterra | 1 |
| Vesaire | 1 |
| Viamonte | 1 |
| Vicari | 1 |
| Vicente | 62 |
| Vico | 1 |
| Victoria | 1 |
| Victoriano | 6 |
| Vidal | 4 |
| Vidau | 8 |
| Vidaurre | 5 |
| Vidondo | 33 |
| Viela | 2 |
| Viesa | 1 |
| Vigüezal | 4 |
| Vila | 1 |
| Vilanueva | 1 |
| Villa | 2 |
| Villaba | 3 |
| Villabriga | 96 |
| Villacampa | 23 |
| Villadequiza | 1 |
| Villahoz | 5 |
| Villalva | 1 |
| Villanoa | 1 |
| Villanueva | 188 |
| Villar | 13 |
| Villareal | 6 |
| Villava | 112 |
| Villegas | 1 |
| Villera | 1 |
| Villuendas | 1 |
| Vinacua | 29 |
| Viñas | 1 |
| Viota | 2 |
| Vique | 63 |
| Visaire | 4 |
| Viscarret | 14 |
| Vital | 2 |
| Vitales | 1 |
| Vitoriano | 11 |
| Vizcay | 8 |
| Vumierez | 1 |
| Ximenez | 60 |
| Yabar | 6 |
| Yarnoz | 1 |
| Yart | 1 |
| Yelz | 29 |
| Yesa | 36 |
| Yesla | 1 |
| Yoldi | 9 |
| Zabaldica | 22 |
| Zabalegui | 20 |
| Zabaleta | 17 |
| Zabalza | 38 |
| Zagastizal | 1 |
| Zagurria | 5 |
| Zalba | 15 |
| Zaldueta | 1 |
| Zalia | 1 |
| Zalva | 8 |
| Zamora | 2 |
| Zapata | 1 |
| Zapico | 1 |
| Zaragoza | 2 |
| Zaratiegui | 30 |
| Zarazo | 1 |
| Zarco | 1 |
| Zariategui | 3 |
| Zariqueta | 5 |
| Zariquiegui | 1 |
| Zaro | 2 |
| Zarranz | 3 |
| Zatoya | 1 |
| Zaviraque | 1 |
| Zazpe | 3 |
| Zemborain | 23 |
| Zildoz | 1 |
| Zito | 1 |
| Zoco | 60 |
| Zolina | 20 |
| Zozaya | 16 |
| Zuasti | 6 |
| Zuazo | 7 |
| Zuazu | 47 |
| Zubiate | 27 |
| Zubieta | 1 |
| Zubiri | 12 |
| Zubiria | 16 |
| Zugarramurdi | 6 |
| Zugasti | 24 |
| Zuñiga | 1 |
| Zunzarren | 27 |
| Zurbano | 3 |
| Zurita | 7 |
| Zurra | 4 |
| Zurutuza | 14 |
| Zuza | 12 |
