From Ó Díomasaigh, ‘proud one’ — chiefs of Clanmalier on the Laois-Offaly border.
The Dempsey certificate.
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Gaelic Origin · Root meaning ‘proud, haughty’
Dempsey comes from Ó Díomasaigh, built on díomas, ‘pride’. The family ruled Clanmalier, a territory straddling the Laois-Offaly border, and held their ground through some of the fiercest resistance to the Tudor plantations in the midlands.
A name that wears its own reputation on its sleeve — pride enough to survive two centuries of plantation warfare.
Irish form: Ó Díomasaigh
