Tregenna is a surname of Cornish origin.
Recorded variations include Treganna, Tregona, Tregannah, Tregunna, Tregunno, Tregensoe, Tregensowe, Tregenza, and Tregenzo.
The name is believed to have originated in the phrase tre-cenue (also tre-gonyow or tre-kensa), meaning the first or foremost farm or homestead on the downs.
Examples from the church registers of Cornwall date to at least as early as 1547.
[1] The name Tregenna may refer specifically to: