Trevelyan Family History
Trevelyan Name Meaning
from Trevelyan in Saint Veep (Cornwall). The place-name derives from Middle Cornish tre(f) ‘estate farmstead’ + either an unrecorded Old Cornish given name equivalent either to Old Breton Ilian or the recorded Old Cornish Milian with mutation of m to v after the feminine noun tre in the latter case.
Source: The Oxford Dictionary of Family Names in Britain and Ireland, 2016