Andrewartha From Cornish tre (“farmstead; settlement”) + gwartha (“higher”). <span class="searchmatch">Trewartha</span> A surname from Cornish. Handbook of Cornish Names by G. Pawsley White...
in Shuntak (south of Canton, in the Canton delta area). 1939, Glenn T. <span class="searchmatch">Trewartha</span>, “Field Observations on the Canton Delta of South China”, in Economic...