From Déiseach, ‘a man of the Déise’ — a name that carries an ancient tribal identity from Waterford rather than a personal ancestor.
The Deasy certificate.
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Gaelic Origin · Root meaning ‘of the Déise people’
Deasy comes from Déiseach, meaning simply ‘a person of the Déise’ — the Déisi being one of Ireland's oldest recorded peoples, whose territory covered much of modern County Waterford and spilled into west Cork. Unlike most Gaelic surnames, it names a whole people rather than one ancestor.
A surname built from belonging to a place rather than descending from a person — older, in a sense, than most family names in this library.
Irish form: Déiseach
