Surnames Starting with O

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OAKLEY English
From a place name meaning "oak clearing" in Old English. It was borne by American sharpshooter Annie Oakley (1860-1926).
OBAMA Eastern African, Luo
From a rare Luo given name meaning "crooked, bent". It was possibly originally given to a baby who had an arm or leg that looked slightly bent immediately after birth or who was born in the breech position.
OBANDO Spanish
Habitational name for someone who came from Obando in Extremadura, Spain.
Ó BAOGHILL Irish
Irish Gaelic form of BOYLE.
O'BERNE Irish
Variant of O'BYRNE.
OBERST German
From Old High German obar meaning "above, upper", indicating a person from the uppermost end of a village or the top of a house.
OBERTI Italian
Derived from the given name UBERTO.
OBERTO Italian
Derived from the given name UBERTO.
O'BOYLE Irish
Variant of BOYLE.
Ó BRÁDAIGH Irish
Irish Gaelic form of BRADY.
Ó BRADÁIN Irish
Irish Gaelic form of BRADEN.
Ó BRAOIN Irish
Irish Gaelic form of BREEN.
Ó BRAONÁIN Irish
Irish Gaelic form of BRENNAN.
Ó BRIAIN Irish
Irish Gaelic form of O'BRIEN.
O'BRIAN Irish
Variant of O'BRIEN.
O'BRIEN Irish
From the Irish Ó Briain meaning "descendant of BRIAN".
Ó BROIN Irish
Irish Gaelic form of O'BYRNE.
Ó BUACHALLA Irish
Irish Gaelic form of BUCKLEY (2).
O'BYRNE Irish
Anglicized form of Irish Ó Broin meaning "descendant of BRAN (1)".
Ó CAISIDE Irish
Irish Gaelic form of CASSIDY.
Ó CAOIMH Irish
Irish Gaelic form of KEEFE.
Ó CAOIMHÁIN Irish
Irish Gaelic form of CAVAN.
Ó CAOINDEALBHÁIN Irish
Irish Gaelic form of QUINLAN.
Ó CATHÁIN Irish
Means "descendant of CATHÁN".
Ó CATHASAIGH Irish
Irish Gaelic form of CASEY.
Ó CEALLACHÁIN Irish
Irish Gaelic form of CALLAGHAN.
Ó CEALLAIGH Irish
Irish Gaelic form of KELLY (1).
Ó CEARMADA Irish
Irish Gaelic form of CARMODY.
Ó CEITHEARNAIGH Irish
Irish Gaelic form of KEARNEY.
OCHOA Spanish
Spanish form of OTXOA.
Ó CIARDHA Irish
Irish Gaelic form of CAREY.
Ó CINNÉIDIGH Irish
Irish Gaelic form of KENNEDY.
Ó CLÉIRIGH Irish
Means "descendant of the clerk" in Irish.
O'CLERY Irish
Anglicized form of Ó CLÉIRIGH.
Ó CNÁIMHÍN Irish
Means "descendant of Cnámh", Cnámh being a nickname meaning "bone".
Ó COCHLÁIN Irish
Means "descendant of Cochlán", where the given name Cochlán is derived from Irish cochal "cape" or "hood". This surname originated in County Cork, Ireland.
Ó COIGLIGH Irish
Irish Gaelic form of QUIGLEY.
Ó COILEÁIN Irish
Means "descendant of COILEAN" in Irish.
Ó COMHRAIDHE Irish
Means "descendant of Comhraidhe", in which the given name Comhraidhe is of unknown meaning.
Ó CONAILL Irish
Irish Gaelic form of CONNELL.
Ó CONCHOBHAIR Irish
Irish Gaelic form of O'CONNOR.
Ó CONGHALAIGH Irish
Irish Gaelic form of CONNOLLY.
O'CONNOR Irish
From Irish Ó Conchobhair meaning "descendant of CONCHOBHAR".
Ó CORCRÁIN Irish
Irish Gaelic form of CORCORAN.
Ó CORRA Irish
Means "descendant of Corra" in Irish. The given name Corra means "spear".
Ó CORRAIDHÍN Irish
Irish Gaelic form of CURRAN.
Ó CUAIG Irish
Irish Gaelic form of QUIGG.
Ó CUANA Irish
Irish Gaelic form of COONEY.
Ó CUIDIGHTHIGH Irish
Irish Gaelic form of CODY.
Ó CUILINN Irish
Means "descendant of Cuileann", Cuileann being a nickname meaning "holly".
Ó CUINN Irish
Irish Gaelic form of QUINN.
Ó CUIRC Irish
Irish Gaelic form of QUIRKE.
Ó DÁLAIGH Irish
Irish Gaelic form of DALY.
Ó DAMHÁIN Irish
Means "descendant of DAMHÁN".
ODELL English
Originally denoted a person who was from Odell in Bedfordshire, derived from Old English wad "woad" (a plant which produces a blue dye) and hyll "hill".
Ó DEORÁIN Irish
Irish Gaelic form of DORAN.
Ó DÍOMASAIGH Irish
Irish Gaelic form of DEMPSEY.
Ó DOCHARTAIGH Irish
Irish Gaelic form of DOHERTY.
Ó DOIBHILIN Irish
Irish Gaelic form of DEVLIN.
Ó DOIRNÁIN Irish
Irish Gaelic form of DURNIN.
Ó DOMHNAILL Irish
Irish Gaelic form of O'DONNELL.
Ó DONNCHADHA Irish
Irish Gaelic form of DONOGHUE.
Ó DONNDUBHÁIN Irish
Irish Gaelic form of DONOVAN.
O'DONNELL Irish
Anglicized form of Irish Ó Domhnaill meaning "descendant of DOMHNALL".
Ó DONNGHAILE Irish
Irish Gaelic form of DONNELLY.
O'DOYLE Irish
Variant of DOYLE.
Ó DUBHÁIN Irish
Means "descendant of DUBHÁN".
Ó DUBHGHAILL Irish
Irish Gaelic form of DOYLE.
Ó DUBHSHLÁIN Irish
Irish Gaelic form of DOLAN.
Ó DUBHTHAIGH Irish
Irish Gaelic form of DUFFY (1).
OELBERG German
Means "oil hill" from Middle High German öl "oil" and berg "mountain, hill".
Ó FAOLÁIN Irish
Irish Gaelic form of WHELAN.
Ó FEARGHAIL Irish
Irish Gaelic form of FARRELL.
OFFERMANS Dutch
From Dutch offer meaning "offering, donation", referring to a person who collected money in a church.
Ó FIONNAGÁIN Irish
Irish Gaelic form of FINNEGAN.
Ó FIONNÁIN Irish
Irish Gaelic form of FANNON.
Ó FLANNAGÁIN Irish
Irish Gaelic form of FLANAGAN.
Ó FLOINN Irish
Irish Gaelic form of FLYNN.
Ó FOGHLADHA Irish
Irish Gaelic form of FOLEY.
Ó FRIGHIL Irish
Irish Gaelic form of FRIEL.
Ó GALLCHOBHAIR Irish
Irish Gaelic form of GALLAGHER.
OGDEN English
From a place name derived from Old English ac "oak" and denu "valley".
OGNIANOV Bulgarian
Alternate transcription of Bulgarian Огнянов (see OGNYANOV).
OGNYANOV Bulgarian
Means "son of OGNYAN".
Ó GORMÁIN Irish
Irish Gaelic form of GORMAN (2).
OGTROP Dutch
Originally denoted a person who was from the town of Ochtrup in Germany, which is of uncertain origin.
Ó HALLMHURÁIN Irish
Irish Gaelic form of HALLORAN.
O'HANNAGAIN Irish
From Irish Ó hAnnagáin, which means "descendant of Annagán". The given name Annagán was a diminutive of Annadh meaning "delay".
Ó HANNAGÁIN Irish
Irish Gaelic form of O'HANNAGAIN.
Ó HAODHA Irish
Irish Gaelic form of HAYES (2).
Ó HAONGHUIS Irish
Irish Gaelic form of HENNESSY.
O'HARA Irish
From the Irish Ó hEaghra, which means "descendant of Eaghra", Eaghra being a given name of uncertain origin. Supposedly, the founder of the clan was Eaghra, a 10th-century lord of Luighne. A famous fictional bearer of this surname is Scarlett O'Hara, a character in Margaret Mitchell's 'Gone With The Wind' (1936).
Ó HEACHTHIGHEARNA Irish
Means "descendant of Eichthighearn", where the personal name Eichthighearn means "horse lord" in Gaelic.
Ó HEAGHRA Irish
Irish Gaelic form of O'HARA.
O'HEARN Irish
Anglicized form of Ó HEACHTHIGHEARNA.
Ó HÉIDEÁIN Irish
Means "descendant of Éideán" in Irish. The given name Éideán is a diminutive of éideadh meaning "clothes, armour".
Ó HEIDHIN Irish
Irish Gaelic form of HINES.
Ó HÉIDÍN Irish
Means "descendant of Éidín" in Irish. The given name Éidín is a diminutive of éideadh meaning "clothes, armour".
Ó HEIDIRSCEÓIL Irish
Irish Gaelic form of DRISCOLL.
Ó HÍCIDHE Irish
Irish Gaelic form of HICKEY.
Ó HIFEARNÁIN Irish
Irish Gaelic form of HEFFERNAN.
OHME German
From Middle High German oem meaning "maternal uncle".
Ó HÓGÁIN Irish
Irish Gaelic form of HOGAN.
Ó HUIGINN Irish
Irish Gaelic form of HIGGINS.
OJEDA Spanish
From the name of the Ojeda river in Soria, Spain, possibly derived from Latin folia "leaves".
OKAFOR Western African, Igbo
From the given name OKAFOR.
O'KANE Irish
Anglicized form of Ó CATHÁIN.
O'KEEFE Irish
Variant of KEEFE.
OKEKE Western African, Igbo
From the given name OKEKE.
OKONKWO Western African, Igbo
From the given name OKONKWO.
OKORIE Western African, Igbo
From the given name OKORIE.
OLA Basque
From Basque ola meaning "hut, small house, forge".
OLÁH Hungarian
Means "Romanian" in Hungarian, from old Slavic volhu "Romance-speaker" (of Germanic origin).
OLANDER Swedish
Denoted someone from the islands of Öland (eastern Sweden) or Åland (western Finland).
Ó LAOGHAIRE Irish
Irish Gaelic form of O'LEARY.
OLASZ Hungarian
Means "Italian" in Hungarian, from old Slavic volhu "Romance-speaker" (of Germanic origin).
Ó LEANNÁIN Irish
Irish Gaelic form of LENNON.
O'LEARY Irish
From Irish Ó Laoghaire meaning "descendant of LAOGHAIRE".
OLEASTRO Spanish
Means "wild olive" in Spanish, originally indicating one who lived near such a tree.
OLESEN Danish
Means "son of OLE".
OLIVER English, Catalan, German, French
Derived from the given name OLIVER.
OLIVERSEN Norwegian
Means "son of OLIVER".
OLIVERSON English
Means "son of OLIVER".
OLIVERSSON Swedish
Means "son of OLIVER".
OLIVIER French
Derived from the given name OLIVIER.
OLMO Spanish
Means "elm tree" in Spanish, ultimately from Latin ulmus. The name originally indicated a person who lived near such a tree.
OLMOS Spanish
Variant of OLMO.
OLOFSDOTTER Swedish
Means "daughter of OLOF".
OLOFSSON Swedish
Means "son of OLOF".
Ó LOINGSIGH Irish
Irish Gaelic form of LYNCH.
OLSEN Danish
Means "son of OLE".
OLSON Swedish, Danish
Anglicized form of OLSSON or OLSEN.
OLSSON Swedish
Means "son of OLAF".
Ó LUAIN Irish
Irish Gaelic form of LANE (3).
ÖLVIRSSON Icelandic
Means "son of ÖLVIR".
Ó MADAIDHÍN Irish
Means "descendant of Madaihín", a given name derived from Irish madadh meaning "dog, mastiff".
Ó MÁILLE Irish
Means "descendant of a nobleman" from the Irish Gaelic mál.
O'MALLEY Irish
Anglicized form of Ó MÁILLE.
ÖMAN Swedish
From Swedish ö meaning "island" and man meaning "man".
Ó MANACHÁIN Irish
Irish Gaelic form of MONAHAN.
Ó MAOIL EOIN Irish
Irish Gaelic form of MALONE.
Ó MAOIL RIAIN Irish
Means "descendant of a follower of RÍAN", derived from Irish maol meaning "follower".
Ó MAOILSHEACHLAINN Irish
Means "descendant of MAOLSHEACHLANN" in Irish.
Ó MAOLÁIN Irish
Irish Gaelic form of MULLEN.
Ó MAOL AODHA Irish
Means "descendant of a follower of Saint AODH". It is derived from Irish maol meaning "follower, servant".
Ó MAOL DHOMHNAIGH Irish
Irish Gaelic form of MOLONEY.
Ó MAOLMHUAIDH Irish
Means "descendant of Maolmhuadh", Maolmhuadh being a given name meaning "proud chief", derived from Gaelic maol meaning "chief" and muadh meaning "proud, noble".
Ó MAONAIGH Irish
Irish Gaelic form of O'MOONEY.
Ó MARCAIGH Irish
Irish Gaelic form of MARKEY.
Ó MATHGHAMHNA Irish
Irish Gaelic form of MAHONEY.
OMDAHL Norwegian
Denoted a person hailing from any one of a number of farms in Norway called either Åmdal or Omdal meaning "elm valley".
Ó MEADHRA Irish
Means "descendant of Meadhra". The given name Meadhra is derived from the Gaelic meadhar meaning "merry, happy".
Ó MOCHÁIN Irish
Irish Gaelic form of MOHAN.
O'MOONEY Irish
From the Irish Ó Maonaigh meaning "descendant of Maonaigh". The given name Maonaigh means "wealthy".
Ó MUIRCHEARTACH Irish
Irish Gaelic form of MORIARTY.
Ó MUIREADHAIGH Irish
Irish Gaelic form of MURRAY (2).
Ó MURCHADHA Irish
Irish Gaelic form of MURPHY.
O'NEAL Irish
From Irish ó Néill meaning "descendant of NEIL".
O'NEILL Irish
Variant of O'NEAL.
Ó NÉILL Irish
Irish Gaelic form of O'NEAL.
ONGARO Italian
Variant of UNGARO.
O'NIALL Irish
Variant of O'NEAL.
Ó NUALLÁIN Irish
Irish Gaelic form of NOLAN.
OOMEN Dutch
Patronymic derived from Middle Dutch oom meaning "(maternal) uncle".
OPEYEMI Western African, Yoruba
From the given name OPEYEMI.
OPPENHEIMER German
Originally indicated a person from Oppenheim, Germany, perhaps meaning "marshy home".
OQUENDO Spanish
Originally indicated a person from the town of Okondo in Álava, northern Spain, possibly derived from Basque ukondo "elbow".
Ó RABHARTAIGH Irish
Irish Gaelic form of RAFFERTY.
Ó RAGHAILLIGH Irish
Means "descendant of Raghailligh", an Irish given name of unknown meaning.
ORBÁN Hungarian
Derived from the given name ORBÁN.
O'REILLY Irish
Anglicized form of Ó RAGHAILLIGH.
ORELLANA Spanish
Originally indicated a person from one of the two towns named Orellana in Badajoz, Spain. Their names are probably derived from Latin Aureliana meaning "of AURELIUS".
ORENSTEIN Jewish
Means "horn stone" in German.
Ó RÍAGÁIN Irish
Irish Gaelic form of REAGAN.
Ó RIAIN Irish
Means "descendant of RÍAN".
Ó RINN Irish
Means "descendant of Rinn". The given name Rinn means "star" in Irish.
ORIOL Catalan
From Catalan or meaning "gold", originally a nickname for a person with blond hair.
ORLANDO Italian
Derived from the given name ORLANDO.
ORLOV Russian
Patronym derived from the Russian nickname Орёл (Oryol) meaning "eagle".
ORMAN Irish
Anglicized form of Ó RUAIDH.
ORMOND Irish
Anglicized form of Ó RUAIDH.
ORMONDE Irish
Anglicized form of Ó RUAIDH.
Ó RODAGH Irish
Means "descendant of Rodach" in Irish. The given name Rodach is derived from from Irish rod meaning "spirited, furious".
OROSZ Hungarian
Means "Russian" in Hungarian.
ORSINI Italian
From a nickname meaning "little bear" in Italian, from Latin ursus "bear".
ORTEGA Spanish
From a Spanish place name (belonging to various villages) derived from ortiga "nettle".
ORTIZ Spanish
Means "son of Orti", a byname deriving either from Latin fortis meaning "brave, strong" or fortunius meaning "fortunate".
Ó RUADHÁIN Irish
Means "descendant of RUADHÁN" in Irish.
Ó RUAIDH Irish
Means "descendant of RUADH" in Irish.
OSBORNE English
Derived from the given name OSBORN.
OSBOURNE English
Derived from the given name OSBORN.
Ó SCOLAIDHE Irish
Means "descendant of the scholar" from Irish scholaidhe.
Ó SÉAGHDHA Irish
Means "descendant of SÉAGHDHA".
Ó SEANÁIN Irish
Irish Gaelic form of SHANNON.
Ó SEIGHIN Irish
Means "descendant of Seighin". The given name Seighin means "small hawk" from Old Irish séigene.
O'SHEA Irish
Anglicized form of Ó SÉAGHDHA.
OSHIRO Japanese
From Japanese (o) meaning "big, great" and (shiro) meaning "castle".
Ó SÍODA Irish
Means "descendant of Síoda", a byname meaning "silk" in Irish.
Ó SIRIDEÁIN Irish
Irish Gaelic form of SHERIDAN.
ÖSTBERG Swedish
From Swedish öst "east" and berg "mountain, hill".
ØSTBERG Norwegian
Norwegian form of ÖSTBERG.
ØSTER Danish
From Danish øst meaning "east", originally denoting a dweller on the eastern side of a place.
ØSTERGÅRD Danish
From Danish øst "east" and gård "enclosure, farm".
OSTROWSKI Polish
From Polish ostrów meaning "river island".
Ó SUAIRD Irish
Means "descendant of Suart" in Irish. Suart is derived from the Old Norse name SIGURD.
Ó SÚILEABHÁIN Irish
Irish Gaelic form of SULLIVAN.
Ó TADHGÁIN Irish
Irish Gaelic form of TEAGAN.
Ó TAIDHG Irish
Irish Gaelic form of TEAGUE (1).
OTIENO Eastern African, Luo
Derived from the given name OTIENO.
Ó TÍGHEARNAIGH Irish
Irish Gaelic form of TIERNEY.
OTIS English
Means "son of ODE".
O'TOOLE Irish
Anglicized form of Irish Ó Tuathail meaning "descendant of TUATHAL".
Ó TREASAIGH Irish
Irish Gaelic form of TRACEY (2).
OTT English, German
From the given name OTTO.
OTTEN Dutch
Means "son of OTTO".
OTTO German
From the given name OTTO.
OTTOSEN Danish, Norwegian
Means "son of OTTO".
OTTOSSON Swedish
Means "son of OTTO".
Ó TUATHAIL Irish
Irish Gaelic form of O'TOOLE.
OTXOA Basque
From Basque otso meaning "wolf".
OURSLER German
Originally a name designating a person from Ursel (now Oberursel) in Hesse, Germany.
OUTLAW English
Means simply "outlaw" from Middle English outlawe.
OUTTERRIDGE English
Derived from the Old English given name UHTRIC.
OVERTON English
Denoted a person who hailed from one of the various places in England called Overton, meaning "upper settlement" or "riverbank settlement" in Old English.
OVESEN Norwegian
Means "son of OVE".
OWEN Welsh
From the Welsh given name OWAIN.
OWENS Welsh
From the Welsh given name OWAIN.
OWSTON English
Denoted a person who came from any one of the places in Britain called Ouston or Owston.
OZOLIŅŠ Latvian
From Latvian ozols meaning "oak tree".
OZOLINSH Latvian
Anglicized form of OZOLIŅŠ.
OZOLS Latvian
Means "oak tree" in Latvian.