Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
GRUBBE
As described in historical dictionaries
Patronymica Britannica (1860)
GRUBBE. "The family of Grubbo, 6pelt in the old registers Griilie or Groube, migrated from Germany about the year 1430, after the Hussite persecutions, and subsequently settled at Eastwell in the parisli of Potterne, co. Wilts, where they have ever since remained. B.L.G. The name is analogous in signification to our Pitt.