Baychester joins nearby Eastchester Bay with the ‘chester’ of older place names.
Forgotten New York describes Baychester as a real estate development of the 1890s whose name combined the ‘chesters’ of Eastchester and Westchester with nearby Eastchester Bay. Lehman College places the area between the colonial settlements of Westchester and Eastchester. ‘Chester’ comes from the Latin castrum, meaning a military camp or fort.