How common is the O'Sullivan surname?

There are approximately 290,000 people with the surname O'Sullivan in the United States.

Are there O'Sullivan soldiers in Civil War records?

Yes, 287 soldiers with the O'Sullivan surname appear in Civil War records.

O'Sullivan

Q: What does the surname O'Sullivan mean?

The surname O'Sullivan means "Descendant of Súilleabháin, derived from the Gaelic 'súil' (eye) and 'dubh' (dark), meaning 'dark-eyed.'". It is of Irish origin.

Patronymic

Meaning

Descendant of Súilleabháin, derived from the Gaelic 'súil' (eye) and 'dubh' (dark), meaning 'dark-eyed.'

Etymology

The surname originates from the Irish 'Ó Súilleabháin,' where 'Ó' denotes 'descendant of.' Súilleabháin combines 'súil' (eye) and 'dubh' (dark), creating a descriptive personal name.

About the O'Sullivan Surname

O'Sullivan is one of Ireland's most common surnames, with strong roots in Munster, particularly in Cork and Kerry. The O'Sullivan family was one of the most powerful clans in Munster throughout medieval times.

Distribution & Frequency

Estimated 290,000 bearers in the United States #220 most common surname

Rare Common

Primarily found in Munster, particularly in County Cork and County Kerry, with large populations in the United States, Canada, Australia, and the United Kingdom.

O'Sullivan Surname Distribution

Geographic distribution based on Civil War military records.

Fewer

P.b. O'sullivan

HONORABLE

Patrick O'Sullivan

Quick Facts

Origin: Irish
Classification: Patronymic
Estimated Bearers: 290,000

War Records

287 soldiers with the O'Sullivan surname found in Civil War records.

Search war records →