"Tre" is a prefix to many Cornish names,
which means "home of" or "homestead".
This page is a grouping of the "Tre" families on my tree. Here is a link to a page which has a translation into English of a number of Cornish surnames.
Ann Tregonning married Thomas Henwood. Their great-granddaughter Mary Elizabeth Henwood married William Treliving Trevan in 1892. They are my great-grandparents.
There are people who are currently researching the name Tregonning, including on the web.
Treliving (a variant of Treleaven, which also has Treleven as a variant)