Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
TUBMAN
As described in historical dictionaries
Patronymica Britannica (1860)
TUBMAN. In the Court of Exchequer the Tubman is, next the Postman, the senior counsel without the Bar.
Surname type: Occupational name
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English