The Guernsey family of BROCK is probably of English origin, but we have been unable to ascertain the period of its first establishment in the island.

The parochial register of St.Peter-Port extends only to the year 1563, soon after which time it contains the name of Philip Brock.
By "Robson's Armorial Bearings of the Nobility and Gentry of Great Britain and Ireland," eight families of the name of Brock appear to bear different arms, one of which was borne by all the Brocks of Guernsey--viz.

azure, a fleur de lis or, on a chief argent a lion pass.
guard.

gu .-- crest, an escallop or[2]--until the death of Sir Isaac Brock, when new and honorary armorial bearings were granted by the sovereign to his family.

Brock is the ancient Saxon name for badger, and as such is still retained in English dictionaries.