History of Manchester
According to Oxford University Press, Manchester derived its name from Mamucium, the Roman name for the 1st century-settlement and fort. Mamucium itself is a Latinised form of the Celtic meaning "breast-shaped hill".
Manchester, Tennessee
A post office called Manchester has been in operation since 1817. The city was named after Manchester, in England. According to historians, "A small village, “Mitchellsville” was already in existence near the proposed site for the new county seat, but when the new county was formed, it was renamed “Manchester” after the industrial city of Manchester, England. Because of the abundance of water power, provided by the “Little Duck” & “Big Duck” Rivers, which flow through Manchester, it was hoped that it also would become a great industrial city."