Surnames Starting with O: Coat of Arms & Last Name Origins

Descendant of Brian Boru

Descendant of Conchobhar

Descendant of Domhnall ("world mighty")

Descendant of Donnchadh ("brown warrior")

Descendant of Eidirsceól ("interpreter")

Descendant of Flaithbheartach ("bright ruler")

Descendant of Grádaigh ("noble, illustrious")

Descendant of Eaghra

Descendant of Caomh ("gentle")

Descendant of Laoghaire ("calf herder")

Descendant of Máille

Descendant of Niall

Descendant of the royal poet

Descendant of Ruarc

Descendant of Tuathal ("ruler of the people")

"wolf" (Basque)

Woad hill

Son-in-law

From Oldham, in Lancashire

"oil presser"

From the personal name Oliver

Olive tree

Son of Oliviero

Son of Ole (Olaf)

From Olszewo, place of alders

From Orlando (Roland)

Famous land (Roland)

"Orm's clearing"

"eagle"

Dun, sallow

"little bear"

Nettle; grouse

Son of Orti / Fortunio

God bear

"aspen grove"

From an old personal name

From Ostrów, river island

From the name Oswald

"hillock"

Wealth, prosperity

Son of Owen (Owain)