Gaelic sept

Dennis

Ó Donnghusa
Also: Denis, Dennison, Denison, Denson

“descendant of Donnghus, ‘brown choice’”

The sept's historic heartland, highlighted. People moved — a name can be found far from home.

Quick answers
Is Dennis an Irish name?

Dennis is a Gaelic name: it was formed in Irish, from an Irish ancestor, before English was spoken here. In Irish the name is Ó Donnghusa.

What does the surname Dennis mean?

Dennis (Irish: Ó Donnghusa) means “descendant of Donnghus, ‘brown choice’”. Origin: Gaelic sept.

Where in Ireland is the surname Dennis from?

The historic homeland of the Dennis name is Cork, Waterford. People moved, so the name can be found far beyond it.

What is the Irish for Dennis?

Ó Donnghusa. Related spellings: Denis, Dennison, Denison, Denson.

Looking for the Dennis family crest? Read this first — arms belong to people, not surnames, and the honest version is more interesting. Tracing Dennis ancestors? The step-by-step guide.

Not your spelling? Try the full A–Z. Know more about the Dennis name? Add to the story.