O'brien

Irish

"descendant of Brian"

O'brien Origin and Meaning

The name O'brien is a boy's name of Irish origin meaning "descendant of Brian".

The use of O-prefixes could create the next wave of Irish-inflected names, offering an innovative way of honoring a relative with the old-fashioned moniker Brian. On Downton Abbey, the surname O'Brien was heard so often, it began to seem like a first.