Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
JEFFERY
As described in historical dictionaries
Patronymica Britannica (1860)
JEFFERY. JEFFERAY. The Teutonic personal name Godfridus, whence also Godfrey. In Domesday the ordinary form is Goisfridus. From it we get the modifications and derivatives, Jefferson, Jcaffreson, Jeffries, Jeff cries, Jefferiss, Jefl', Jeffs, JeiAson, Jepson, Jeffcock, Jefkins, with minor variations of spelling too numerous for insertion.
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