Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
TERRY
As described in historical dictionaries
Patronymica Britannica (1860)
TERRY. Not ' the tearful one ' as some etymologists have it, but a corruption of Theodoric, the personal name, like the Fr. Thierry. In H.R. Terri and Terry are without prefix.
Surname type: From given name or forename
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English