Surnames Starting with O

Ancestry
Holiday Sale: 65% off AncestryDNA. Offer ends 11/19. Terms apply.
Discover your ethnicity and find relatives with AncestryDNA.
Can’t find your family name?
Help grow AncestryData by adding a deceased ancestor with that surname.
Add it here
Confirm this record
Profiles are only created for people who have passed away. Add a death year, or a birth year more than 110 years ago.
- O'brien(11)
- O Connor(6)
- O'dell(2)
- O'donnell(2)
- O'hara(1)
- O'neal Barrett(1)
- O'neil(4)
- O'neill(3)
- O'quinn(2)
- O'regan(1)
- O'reilly(1)
- O'rorke(2)
- O'rourke(12)
- Oakes(2)
- Oakman(1)
- Obanhein(4)
- Obenhaus(1)
- Ober(4)
- Ober Hunt(1)
- Oberg(2)
- Obray(1)
- Obrien(1)
- Ocko(2)
- Odekirk(1)
- Odell(9)
- Oebernaro(1)
- Oeiras(3)
- Oeschger(2)
- Offerman(5)
- Offield(3)
- Ofsik(2)
- Ogden(4)
- Ogle(2)
- Ogles(2)
- Ohara(2)
- Ohe(3)
- Ohlmacher(1)
- Ohrt(1)
- Okelberry(27)
- Olaffesen(1)
- Olaffsen(1)
- Oldaker(2)
- Oldfield(18)
- Olds(1)
- Olewine(2)
- Olguin(1)
- Oliver(15)
- Oliverson(2)
- Olkone(1)
- Olkonen(2)
- Ollieu(1)
- Ollieu Marraine(1)
- Olmstead(7)
- Olnhoff(1)
- Olsen(33)
- Olson(105)
- Oneil(3)
- Oney(1)
- Ontiveros(3)
- Ooder(1)
- Opdycke(5)
- Opheikens(6)
- Opland(1)
- Opp(1)
- Oppenhuizen(9)
- Oquendo(2)
- Oram(4)
- Oravsky(4)
- Orawiec(1)
- Orchard(4)
- Ordway(5)
- Oreilly(1)
- Orell(3)
- Oren(1)
- Orfeur(1)
- Ormand(2)
- Ormond(8)
- Orozco(2)
- Orr(3)
- Ortega(1)
- Ortegon(2)
- Ortiz(1)
- Orton(4)
- Orts(5)
- Orvansky(1)
- Osborn(5)
- Osborne(4)
- Osborne Brown(1)
- Osburn(2)
- Osgood(13)
- Osman(1)
- Osmer(1)
- Osmun(2)
- Osnato(3)
- Osredkar(1)
- Ostergren(1)
- Osterling(1)
- Ostrom(1)
- Oswald(11)
- Oswalt(1)
- Otero(4)
- Ott(7)
- Otterback(1)
- Ottis Fleek(1)
- Otto(11)
- Ouellet(1)
- Ourant(5)
- Ourensma(1)
- Outlaw(1)
- Outlette(1)
- Ovadek(9)
- Overbey(2)
- Overbye(4)
- Overlook Smith(1)
- Overweg(1)
- Owen(3)
- Owen Weaver(1)
- Owenby(2)
- Owens(17)
- Owens-Heath(1)
- Ownes(1)
- Oyler(7)
- Ozmun(1)

Ancestry
AncestryDNA® with Traits
Ethnicity estimate, DNA matches and personal traits.

Ancestry
Holiday Sale: 65% off AncestryDNA. Offer ends 11/19. Terms apply.
Discover your ethnicity and find relatives with AncestryDNA.

Ancestry
AncestryDNA® with Traits
Ethnicity estimate, DNA matches and personal traits.
