Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
BLACKETT
As described in historical dictionaries
Patronymica Britannica (1860)
BLACKETT. Dan. hlakhcU greyish. Ferguson. But the B.'s of Northumb. trace to Richard de Black-heved, or Blackhead, forester of Stanhope, 1350 ; and the name is consequently local.
Surname type: Diminutive
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English