from Gotham, the name of a village, proverbial for the folly of its inhabitants.
(From E-NED: There is a village so named in Nottinghamshire, England, but it is not certain that this was the place alluded to.)
1589 - Preface to Robert Greene's Menaphon, Thomas Nashe;
see Example below
From: The Complete Works of Thomas Nashe
Edited by the Rev. Alexander B. Grosart
Volume I, 1589-1590
Printed for Private Circulation, 1886-84