Trewartha

Trewartha and Andrewartha are Cornish family names (and placename, Dexter). There are places called Trewartha in the parishes of Merther, St Agnes, St Neot and Veryan.

According to the Handbook of Cornish Names by G. Pawley White, "Trewartha" is a Cornish name meaning "Upper Farm" or "Upper Homestead".