Trewin Family History
Trewin Name Meaning
Cornish (Cornwall and Devon): habitational name from Trewin in Sheviock (Cornwall) Trewin in Lanteglos near Camborne (Cornwall) and perhaps also from one or more of the places in Cornwall called Trewen. The placenames probably derive from Middle Cornish tre ‘estate farmstead’ + guyn ‘white’.
Source: Dictionary of American Family Names ©2013, Oxford University Press