O'REILLEY

Patronymic

Meaning

Descendant of Raghallach, meaning 'valiant' or 'fierce'.

Etymology

Irish patronymic from Ó Raghallaigh, derived from the personal name Raghallach. The name evolved through anglicization of the Irish prefix 'Ó' to 'O'.

About the O'REILLEY Surname

An Irish surname derived from the Gaelic patronymic prefix Ó combined with Raghallaigh. The spelling O'Reilley represents an anglicized variant of the more common O'Reilly.

Distribution & Frequency

Estimated 8,000 bearers in the United States #1,263 most common surname
Rare Common

Primarily Ireland and Irish diaspora communities.

O'REILLEY Surname Distribution

Geographic distribution based on Civil War military records.

Fewer
More

Notable Bearers

Variant of O'Reilly; specific bearers of this spelling are less documented

People with the O'REILLEY Surname

R.m. O'reilley

GENERAL