from Greek grobian, from medieval .Latin Grobiānus, name of an imaginary personage, often referred to by writers of the 15–16th c. in Germany as the type of boorishness, from Greek grob coarse, rude
From: Choice Specimens of English Literature
Edited by Thomas Budd Shaw, Sir William Smith
Chapter V. The New Philosophy and Prose Literature in the Reigns of Elizabeth and James I.
Robert Burton, 1576-1640