Meaning the 'Son of Trevi' (petit Trevi) and probably derived from the Olde Welsh 'Trefor' meaning 'Homestead', but nevertheless a pre 10th Century personal name. A further possible origin is from Troite - i.e. Son of Troite, Olde English, and derived from Geutrude. The first recorded spelling of the family name is shown to be that of John Trivet. which was dated 1328, The Somerset County Rolls. during the reign of King Edward 111, 1327 - 1377 Surnames became necessary when governments introduced personal taxation. In England this was known as Poll Tax. Throughout the centuries, surnames in every country have continued to "develop" often leading to astonishing variants of the original spelling.