Surnames Starting with O: Coat of Arms & Last Name Origins
30 family names beginning with O. Open a name to read its surname origin, its meaning and the heraldry associated with it.
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O'BrienIreland
Descendant of Brian Boru
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O'ConnorIreland
Descendant of Conchobhar
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O'DonnellIreland
Descendant of Domhnall ("world mighty")
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O'DonoghueIreland
Descendant of Donnchadh ("brown warrior")
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O'DriscollIreland
Descendant of Eidirsceól ("interpreter")
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O'FlahertyIreland
Descendant of Flaithbheartach ("bright ruler")
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O'GradyIreland
Descendant of Grádaigh ("noble, illustrious")
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O'HaraIreland
Descendant of Eaghra
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O'KeeffeIreland
Descendant of Caomh ("gentle")
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O'LearyIreland
Descendant of Laoghaire ("calf herder")
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O'MalleyIreland
Descendant of Máille
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O'NeillIreland
Descendant of Niall
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O'RiordanIreland
Descendant of the royal poet
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O'RourkeIreland
Descendant of Ruarc
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O'TooleIreland
Descendant of Tuathal ("ruler of the people")
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OdellEngland
Woad hill
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OdomEngland
Son-in-law
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OliverEngland
From the personal name Oliver
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OlivierFrance
Olive tree
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OlivieriItaly
Son of Oliviero
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OlsenDenmark
Son of Ole (Olaf)
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OlszewskiPoland
From Olszewo, place of alders
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OrlandoItaly
Famous land (Roland)
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OrrScotland
Dun, sallow
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OrtegaSpain
Nettle; grouse
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OrtizSpain
Son of Orti / Fortunio
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OsborneEngland
God bear
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OstrowskiPoland
From Ostrów, river island
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OttoGermany
Wealth, prosperity
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OwensWales
Son of Owen (Owain)
Browse by country of origin
- English405 surnames
- Irish200 surnames
- Scottish97 surnames
- Welsh37 surnames
- Italian191 surnames
- German199 surnames
- French108 surnames
- Spanish97 surnames
- Polish78 surnames
Every surname can be researched, even if it isn't listed here.
Researched by Herald Lab Research Studio, since 1993. Coats of arms were granted to individuals, not to everyone with a surname.