Irish surname evidence

Clarke surname origin and Irish county evidence

The strongest processed county signals for Clarke include Tyrone. These are evidence clusters rather than proof that every Clarke family began in one place.

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Name history

What the historical record says

Clarke commonly anglicises the Gaelic Ó Cléirigh, meaning "descendant of Cléireach," from cléireach (clerk, cleric or scholar), itself from the Latin clericus. One of Ireland's oldest recorded surnames, it traces to Cléireach of Connacht and his descendant Tighearnach Ua Cléirigh, lord of Aidhne in south County Galway, who died in 916. The Norman upheavals scattered the sept to Donegal, Mayo, Cavan and Kilkenny. In Donegal they became hereditary poets and genealogists to the O'Donnells; by Griffith's Valuation, Cavan held the greatest concentration of Clarke households.

Recorded Gaelic root: Ó Cléirigh

County evidence

Strongest county signals

  1. Tyroneprocessed surname/place signal
Read this carefully

What this evidence can—and cannot—prove

Census clustering can show where a surname appeared strongly at a historical point in time. It cannot identify your exact ancestor, prove a clan relationship, or assign a coat of arms. Use it as a source-backed starting point alongside family records and parish research.