Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
TREHERNE
As described in historical dictionaries
Patronymica Britannica (1860)
TREHERNE. An ancient Welsh personal name, as Trahern ap Caradoc, Prince of North Wales, 1073.
Surname type: Location or geographical feature
Origin: Anglo-Saxon
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English