This interesting name has been transposed from its original Cornish spelling. It derives from the Manor of Trevarthian in the Parish of Newlyn, New Truro. The name means 'The Homestead of Arthen', a Cornish - Celt form of the personal name Arthur. The Coat of Arms for Travarthian of Newlyn is silver, a red boar passant, armed in gold, between three knights spurs in red. There is also an 'American' name Treveathan, which may also be a variant spelling considering the numbers of Cornish who went to America. The first recording is believed to be as shown. The first recorded spelling of the family name is shown to be that of James Trevenen (as spelt). which was dated 1776, Served with Captain Cook in the Pacific. during the reign of King George 111, 'Farmer George' 1760 -1820. 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.