Bullock is the surname of an English family that traces its roots to the County of Berkshire in the 12th century. Notable members of the family of Arborfield, and later of Faulkbourne in Essex, include Robert Bullock (d. 1405) Sheriff for the Counties of Berkshire and Oxfordshire, Sir Edward Bullock of Falkborne (c. 1580 - 1644), Edward Bullock (1663–1705) M.P and High Sheriff of Essex, Colonel John Bullock (1731–1809) M.P, Professor Walter Llewellyn Bullock (1890–1944) and Sir Christopher Bullock (1891–1972).
Guy Henry Bullock (1887-1956), who reconnoitered Mount Everest with George Mallory in 1921, was a member of the Radwinter branch.
The family name is derived from the Anglo-Saxon, "bulluca", a young bull, and being linked to the old Anglian and Norman Christian name Osmund, represents one of the earliest instances of an English hereditary surname that was a purely personal nickname in origin.
The origins of the name 'Arborfield' remain uncertain. The family is first recorded in 1166 in Edburgefeld, meaning 'Edburga's Field', (Edburga being a widespread Saxon lady's name) which evolved through variations to the modern Arborfield as first recorded in the 17th century.
The earliest recording of the family is Osemundus Bulloc in the Pipe Rolls of Berkshire in 1166. The Herald’s Visitations of the 15th century record his son, Richard, and these, and later visitations, carry the descent in an unbroken line to Edward Bullock of Faulkbourne in 1664.