503+ Last Names Starting With O: Unraveling Their Legacy

Last names that start with “O” come from different places and have interesting stories. In Irish names like O’Brien, the “O” means “descendant of.”

In Japan, names like Ogawa connect to a river. Italian names like Orsini might have noble roots. For Scandinavians, names like Olsen mean “son of Olof.”

Portuguese names like Oliveira point to olive trees. So, “O” names show where families come from and their unique histories, making each one special.

Top Last Names Starting with O

Prominent last names beginning with “O” include O’Connor, with Irish origins denoting “descendant of the warrior,” and Olsen, a Scandinavian name meaning “son of Ole.”

These surnames often carry rich cultural histories, reflecting ancestral ties and traditions. They contribute to the diverse tapestry of surnames worldwide.

Last Name	Meaning
O’Connor	Descendant of the warrior (Irish)
Olsen	Son of Ole (Scandinavian)
O’Brien	Descendant of Brian, meaning “noble” (Irish)
Ortiz	Son of Ortun, meaning “fortune” (Spanish)
Osbourne	From the divine fortification (English)
O’Neill	Descendant of Niall, meaning “champion” (Irish)
Obrien	Descendant of Brian, meaning “noble” (Irish)
Osman	Pure (Arabic)
Ochoa	Wolf (Basque)
O’Malley	Descendant of Máille, meaning “noble” (Irish)
Overton	Upper farm or settlement (English)
Oliveira	Olive tree (Portuguese)
O’Hara	Descendant of O’Héara, meaning “lord of the western sea” (Irish)
Okamoto	Ridge or hill (Japanese)
Olsson	Son of Olof (Scandinavian)
O’Meara	Descendant of Meara, meaning “merry” (Irish)
Osaki	Big peninsula (Japanese)
O’Donnell	Descendant of Domhnall, meaning “world ruler” (Irish)
Ortega	Net or network (Spanish)
Oberon	Noble bear (Germanic)

Most Common Surnames Starting with O

O’Connor and O’Brien are among the most common Irish surnames starting with ‘O.’ Rooted in Irish history, O’Connor signifies “descendant of the warrior,” while O’Brien translates to “high” or “noble.” These surnames reflect rich cultural heritage and are widely found in Irish diaspora communities worldwide.

Last Names Starting with O

Last names starting with O encompass diverse origins and meanings. Examples include O’Connor, of Irish origin, denoting “descendant of the lover of hounds,” and Ortiz, a Spanish surname signifying “son of Orti.” Each O surname holds a unique history, reflecting cultural richness and familial legacies across the globe.

Popular Last Names that Start with O

O’Connor, O’Brien, O’Neill, and O’Sullivan are among the popular last names that start with “O.” These Irish surnames often signify a connection to a specific ancestor or clan. The “O” prefix means “descendant of,” reflecting a rich heritage and history in Irish culture.

Famous Last Names that Start with O

O’Neill, a renowned Irish surname, carries a legacy of resilience and leadership. Notable figures include Eugene O’Neill, a Nobel Prize-winning playwright, and Hugh O’Neill, an influential Gaelic lord. The O’Sullivans, another esteemed Irish clan, boast historical significance. These last names symbolize rich heritage and contributions across various fields.

Short Last Names that Start with O

“Owens, Olson, and Ochoa are examples of short last names beginning with O. These concise surnames carry a distinctive charm, often rooted in diverse cultural backgrounds. Despite their brevity, names like O’Connor or Ortiz encapsulate rich histories, making them unique identifiers that resonate with familial pride and heritage.”

Surnames Starting with O

Surnames starting with O often trace their origins to diverse cultures. In Irish, O denotes “descendant of,” as seen in O’Connor or O’Brien. In Japanese, it signifies “big” or “great,” seen in surnames like Oda. Across various cultures, surnames beginning with O carry rich historical and familial significance, reflecting ancestral ties.

O’Connor	O’Neill
O’Brien	O’Sullivan
Olson	Ochoa
Osborn	O’Donnell
Ortiz	O’Leary
Owens	O’Grady
Osborne	O’Malley
Oakley	Ogden
Odom	O’Reilly
O’Neill	O’Connor
O’Donnell	Osborne
O’Sullivan	Olson
O’Brien	Oakley
Ochoa	Owens
O’Malley	Ortiz
O’Leary	Ogden
O’Reilly	Osborn
Odom	O’Grady
O’Neal	Oliver
Osborne	O’Connor
O’Neill	Olson
O’Sullivan	Ochoa
O’Reilly	O’Leary
O’Donnell	O’Brien
Ortiz	Ogden
Osborne	O’Malley
Oakley	Owens
O’Grady	Odom
O’Neal	Oliver
Osborn	Ochoa
O’Sullivan	O’Brien
O’Leary	O’Reilly
Olson	O’Malley
O’Donnell	Odom
O’Grady	Ogden
Ortiz	O’Neill
Osborne	O’Sullivan
Owens	Oliver
O’Reilly	Ochoa
Oakley	O’Neal
O’Malley	O’Brien
Osborn	Olson
O’Donnell	O’Sullivan
O’Leary	Ogden
Odom	Ortiz
O’Grady	Owens
O’Reilly	Osborne
Ochoa	O’Neill
Oliver	O’Sullivan
O’Neal	O’Brien
Olson	O’Donnell
Oakley	O’Reilly
Ogden	Osborne
Ortiz	O’Malley
Owens	Ochoa

Long Last Names that Start with O

Long last names starting with O often evoke a sense of heritage and history. Examples like O’Reilly, O’Sullivan, and O’Connor are prominent in Irish ancestry, reflecting familial roots. These names carry a unique charm, encapsulating generations of tradition and familial connections that endure through time, adding depth to one’s identity.

Cool Last Names Starting with O

Last names or surnames are very important as they link us to our family and the past of our families. So having the last name is very essential. If you are specifically looking for last names that start with O, scroll down for some cool last names that start with O. 

Oberg: Of French origin 

Obioha: People’s heart 

Obermier: Of US origin 

Oberson: Of Us origin 

Oates: Riches 

Oberfeld: Most famous last name used as of 2010

Oaxaca: Of Hispanic origin 

Oblack: Most favoured surname

Oberley: Ober variant 

Obaya: This is a Latino last name 

Obenauer

O’Neall

O’Mahony

Oakley

O’Bray

O’Barrman

O’ Brien

O’Breine

Oelkers

Offerman

Oatman

O’Driscoll

Olshefski

Oberg

Oechsner

O’Roark

O’ Neile

O’Brien Dillon

O’Bierne

Oetting

Oetken

Ochsner

O’Bridget

O’Dowd

Oetzel

O’Boyce

O’Gorman

O’Bin

Ochoa

Oberhauser

Obey

Oltz

O’Bruin

O’Byrne

O’Bar

Oltmans

Offermann

O’Breland

Offield

O’Beiru

Offenbacker

Olmo

O’Boy

Omlor

O’Harra

O’Hare

Oeltjenbruns

O’Melia

O’Berry

Offenbacher

Oen

O’Kane

O’Quin

Oberto

O’Donald

O’Bay

O’Baoill

O’ Connor

O’Bryant

Ockert

O’ Driscoll

Oeser

Onken

Olmeda

Oddi

O’Maley

O’Guin

Olley

O’Sullivan

Oosting

Odeh

Obando

O’ Hagan

Oeltjen

O’Meara

O’Conner

Oester

Ooms

O’Hagan

O’Biren

Ocampo

O’ Reilly

Ondrey

Occhino

Olliff

Oatis

Oechsle

O’Neal

O’Hearn

Onofrey

Fun fact about Oberg: Oberg is one of the most commonly used upper-class surnames in France. 

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Catchy Last Names Starting with O

Do you want some cool last names that start with 0? Well, you are on the right page if you want to. We have in lot some catchy last names that start with o. the first ten names are inclusive of meanings. So, scroll down our page to know more. 

Ogaan: United

Olik: Rich

Osha: Shining

Oma: The one who leads 

Onir: Shining

Osho: Dear

Ojesh: Light

Orla: The one who is a princess of gold 

Omor: Awesomeness

Odika: Wild rice or anklet

O’ Hara

O’Baoighill

O’Beirn

O’Conor

Olman

Oclair

Olmstead

Odierno

O’Beirne

O’ Malley

Onnen

Oest

Onderko

Ochman

O’Bryam

O’Rear

Odland

O’ Hare

Oborny

Oathout

O’Haver

Obremski

O’Beirne

Ockenfels

O’ Neill

O’Bree

Om

Obara

O’Bornick

O’Donoghue

O’Shaughnessy

O’Cain

O’Barr

O’Boyle

Ooten

Ogan

Obermann

O’Bey

Oberst

O’Berg

Omori

O’ Sullivan

Obermeier

O’ Grady

Oberhaus

Ollison

O’Brady

Oare

Olofson

Olstad

O’ Neil

Oczkowski

Ondracek

O’ Leary

On

O’Brine

O’Brin

O’Brien-Malone

Oddy

Obi

O’Banion

Olmsted

O’Flanagan

O’ Griffiths

Oblak

Odgers

Ogas

Oats

Omundson

O’Kelley

O’Hara

O’Brennan

Oder

Oberlander

Obradovich

O’Barry

O’Brien-Furlong

Onder

Odenthal

Onan

Olver

O’Toole

Obermiller

Onderdonk

O’Regan

O’Callaghan

O’Grady

Ommen

Ooley

Olmos

Fun fact about Onir: Onir is a Sanskrit-originated name that depicts a shiny object or something that shines.  

Related: Common White Last Names

Best Last Names Starting with O

Being the best or having the best neds time and effort. If you are searching for the best last names that start with O, we are here for you with the best last names that start with o. the first ten names are written with their meanings too. scroll down to read the best names. 

Omio: Rock

Obaid: Gracious

Ozal: Vision

Ormazd: Divinity or wisdom

Oraibia: Keen to learn 

Onil: Wind

Ozhan: The one who throws 

Odhara: Affection

Oba: An ancient goddess of the rivers 

Omsri: Devotional

Ocheltree

Odell

Oesch

Oberbeck

O’ Riordan

Oberlin

O’Neil

Och

Oberholzer

O’Mary

O’Guinn

Oncale

O’Loughlin

O’Dwyer

O’Batt

Ono

Odoms

Ocon

Obringer

Ode

Oberbroeckling

Oberhelman

O’Higgins

O’Connor

Oborn

O’Hanlon

Omdahl

O’Brian

O’Keeffe

Off

Obenhaus

Oganesyan

Olszewski

O’ Donoghue

Oakland

O’Boo

O’Donohue

O’Brian

O’Baren

Offer

O’ Rourke

O’Bryan

Odneal

Oehlerking

O’Malley

Obenour

Oesterle

Oertle

O’Brien-Butcher

O’Kelly

Oachs

O’Aigh

Oatley

Obrochta

O’ Doherty

Ockerman

Oberholtzer

Obermark

O’Gara

Oestmann

O’ Shea

O’Riley

Oates

Olsson

Oak

Ocasio

O’Brien Caffrey

O’Bryan

O’Briens

O’Beisin

Obrecht

O’Brettle

Odorizzi

O’Bannon

O’Boren

Odden

Ollila

Oettinger

Oden

O’Briant

O’Brien-Weeks

Odor

Oesterling

Oehm

Omar

Oehler

Onorato

Odle

Oftedahl

Odenwald

Related: Last Names That Start With R

Awesome Last Names starting with O 

Coming up with awesome last names is quite a task, no? but do not worry, we are here for you and are ready with the most awesome Last Names that start with O. you would love the names we have for you on our list. Just scroll down!

Ojasi: Energetic

Opel:  A precious jewel 

Omna: Pure

Osaf: A beautiful dancer

Omni: Goddess

Omol: Time Lord

Osmi: Bride

Ori: Charitable ruler

Ojal: Splendid

Oren: Ash tree or pine tree

Oddo

Onstad

Odiorne

Opal

Oei

Obie

Olson

O’Bardain

Oba

O’Herron

Olthoff

O’Bear

O’ Farrell

O’Branne

O’ Hanlon

Oehrlein

O’ Brian

Oberle

Omura

Oltmanns

Oller

O’Breen

Omo

O’Carroll

Obrzut

O’Brien

Oas

O’Bee

Oehl

Obuchowski

Oelfke

O’ Connell

Oehlert

O’Anderland

Oltman

Ollmann

Onley

O’Flynn

O’Brart

O’Callahan

O’Beirne Ranelagh

O’Bren

Oelke

Odermatt

Oertel

O’Day

O’Broin

O’Daniel

Oehme

Oakman

Oda

Oosterhouse

Onishi

Onofre

Oberman

O’Neill

O’Neel

Odendahl

Onaga

O’Ryan

Oesterreich

Ollom

O’ Donnell

Ober

O’Keefe

Obert

Oman

O’ Keefe

O’Briain

O’ Niel

Oceguera

O’Haire

O’Connell

Ocken

Ontko

Olszanski

O’Hora

Olmscheid

Oetjen

Oltrogge

O’Donnel

Olwell

O’Brins

Oneto

O’Brice

O’Brien

Ocegueda

O’Bran

Olshan

Oehlke

Ollie

O’Brien Gore

O’Dea

Oblander

O’Riordan

O’Dean

Olney

Obergfell

Oltmann

Offerdahl

Omans

Oelrich

O’Blath

O’Harrow

Offord

O’Hair

O’Borne

Odekirk

O’Donnell

Occhipinti

O’Brion

Olmedo

Oberhausen

Ocana

Oberstein

Obregon

Olvera

O’Mahoney

O’Farrell

Onate

Oeding

Olshansky

Oberley

O’Berry

Offenberger

O’Bien

O’ Farrel

Obray

Offill

Obermeye

Fun Fact about Oren: Oren is a Gaelic word, which is locally used to depict a pine tree found in the hills. 

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Amazing Last Names Starting with O

Lastly, we know it has been tough for you to choose an amazing name, so we are making it easy for you now. In the list down below, we have amazing and most used last names that start with o. scroll down as the list might be helpful for you. 

Oshin: Ocean or open waters

Oorvi: Earth

Oviyan: Artist

Omi: The sound radiated from the universe

Omran: Solid state

Omkrish: Lord Krishna

Ovya; Beautiful art by a artist 

Onik: Soldier

Ojasin: Strong 

Oni: Desired or wanted

Ollis

Oaks

Occhiogrosso

Oestreich

Onufer

O’Hern

Oe

O’Flaherty

O’Brae

Obee

Oommen

Odum

Olp

Ontiveros

Obst

O’Brein

O’Leary

O’Doherty

Odom

O’Brienn

O’Brion

Onsager

O’Bryon

Offner

Odegaard

O’Berty

Omer

O’Brieun

Oncken

Odette

O’ Donald

Ondo

Oberdick

Oertli

Olsen

O’Fallon

O’Halloran

Ollinger

Oberdorf

Offutt

Oestreicher

Ochs

O’Reilly

Odem

Oberly

O’Boyle

O’Donovan

O’Bedant

Olund

Oehmke

Related: Popular Hebrew Last Names

Conclusion

last names that start with “O” carry rich stories from various cultures. From Irish O’Sullivans to Italian Orlandos, each name reflects unique family histories. These names link people to their roots, adding diversity and meaning to our shared human tapestry.

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