Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
KEATE
As described in historical dictionaries
Patronymica Britannica (1860)
KEATE. KEATS. An old Cornish family bore the former name, as also did the extinct baronets of the Hoo in Hertfordshire. Hals, the Cornish topographer, gives this veiy uncomplimentarj derivation of the name: '•'■ Keate, ceate, in British is fallacy, cheat, or delusion."