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Bulle Rock is not mentioned in Britain's "General Stud Book", which did not exist at the time of his birth, and, although the revised Volume 1 mentions some sons of the Darley Arabian, Bulle Rock is not among them, an omission possibly due to compiler James Weatherby having no knowledge of the dam. Pick's "Turf Register" references a Bullyrock, by the Darley Arabian, out of an "indifferent mare", which "The Sportsman" newspaper claims was "evidently the same horse" The name derives from sixteenth and seventeenth-century literature where it meant "boon companion". The term "my Bully Rooke" is used by Falstaff in Shakespeare's "Merry Wives of Windsor".