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Definitions by Ms. Ní Dhíomasaigh

Dempsey is a surname of Irish origin.

Dempsey is a variant of O'Dempsey, first recorded as Dempse in 1526. It represents the Anglicized form of the Irish gaelic Ó Díomasaigh (male) or Ní Dhíomasaigh (female)
Niamh Ní Dhíomasaigh (Niamh Dempsey)
Seamus Ó Díomasaigh (James Dempsey)