Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
BARNETT
As described in historical dictionaries
Patronymica Britannica (1860)
BARNETT. A town in Hertfordshire, and parishes in that co. and in iliddlesex and Lincoln. In many instances the name Barnard is so corrupted. It is — why I know not — a common name among the Jews.
Surname type: Diminutive
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English