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- Spanish surnames by initial letter
These last names have appeared during the ancestry investigations carried out for our clients, so that the list is constantly updated.
Contact us for more information on any surname that is or is not on the list.
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| O'Neale |
| Oar |
| Oarriz |
| Obejero |
| Oberto |
| Obieta |
| Obispo |
| Obregón |
| Obón |
| Oca |
| Ocafrain |
| Ocampo |
| Ocaña |
| Ochando |
| Ocho |
| Ochoa |
| Ochoba |
| Ocón |
| Odena |
| Odria |
| Odriozola |
| Ogayar |
| Oguiñena |
| Oiarvide |
| Ojanguren |
| Ojeda |
| Ojedo |
| Olabarri |
| Olabarria |
| Olabarrieta |
| Olabezela |
| Olaechea |
| Olaeta |
| Olaguenaga |
| Olaguibel |
| Olagüe |
| Olaizola |
| Olalla |
| Olano |
| Olaoechea |
| Olaran |
| Olarte |
| Olartecoechea |
| Olaso |
| Olavarría |
| Olave |
| Olaya |
| Olazabal |
| Olazaguirre |
| Olbrich |
| Olcina |
| Olea |
| Olias |
| Olibares |
| Oliber |
| Olid |
| Oliete |
| Oliva |
| Olivares |
| Olivart |
| Olivas |
| Oliveira |
| Olivella |
| Oliver |
| Olivera |
| Oliveras |
| Olivos |
| Olivé |
| Oller |
| Olleta |
| Ollo |
| Olloqui |
| Olloquiegui |
| Ollé |
| Olmedilla |
| Olmedo |
| Olmo |
| Olmos |
| Olona |
| Oltra |
| Olvera |
| Omedes |
| Omené |
| Onaindia |
| Oncinos |
| Oncins |
| Ondiviela |
| Onieva |
| Onofre |
| Onrubia |
| Ontiñano |
| Ontoria |
| Oquiñena |
| Oquéluri |
| Or |
| Ora |
| Oramas |
| Orbegozo |
| Orbezu |
| Orbiso |
| Orcajada |
| Orcajo |
| Orco |
| Ordeix |
| Ordeñana |
| Ordiz |
| Ordiñola |
| Ordoña |
| Ordoñana |
| Orduña |
| Ordás |
| Ordóñez |
| Oreja |
| Orejuela |
| Orejón |
| Orellana |
| Orenich |
| Orero |
| Orgaz |
| Oria |
| Oribe |
| Orihuela |
| Oriol |
| Oriols |
| Oriozavala |
| Orive |
| Orlando |
| Orleans |
| Ormaechea |
| Ormazabal |
| Ornat |
| Ornilla |
| Ornillos |
| Orobio-Basterra |
| Ororbia |
| Orosco |
| Orozco |
| Orra |
| Orrantia |
| Orriach |
| Orries |
| Orriols |
| Orta |
| Ortal |
| Orte |
| Ortega |
| Ortega, |
| Ortega-Davalos |
| Ortego |
| Orteu |
| Ortigosa |
| Ortiz |
| Ortolaza |
| Orts |
| Orttuzar |
| Ortuzar |
| Ortuño |
| Ortí |
| Ortín |
| Orueta |
| Oruezabal |
| Osa |
| Osanz |
| Oseguera |
| Oses |
| Osete |
| Osinaga |
| Oslé |
| Oso |
| Osolo |
| Osorio |
| Osoro |
| Ossatnik |
| Osses |
| Ossoro |
| Ostolaza |
| Osuna |
| Otaegui |
| Otal |
| Otamendi |
| Otaolea |
| Otazo |
| Otaño |
| Otegui |
| Oteiza |
| Oterino |
| Otero |
| Oteros |
| Ots |
| Otón |
| Oubiña |
| Outeda |
| Outeiral |
| Outeyro |
| Ovejas |
| Ovejero |
| Oviedo |
| Oyanguren |
| Oyarguren |
| Oyarvide |
| Oyarzun |
| Oyarzábal |
| Oyo |
| Oyos |
| Ozamiz |
| Ozerin) |
| Oñate |
| Oñativia |
| Oñederra |
| osef |