Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
BOLSTER
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Cor. Br. Local) A place in St. Agnes, Wales, and signifies an entrenchment; from Bolla, a casting or throwing up, and ter, the earth. Bolwestur, Welsh, a Hanger-on.
Surname type: Occupational name
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English