"Gravesender” is the name of an inhabitant of Gravesend, in the borough of Brooklyn. The name “Gravesender” has been cited in print since at least 1839.
Wikipedia: Gravesend, Brooklyn
Gravesend is a neighborhood in the south-central section of the New York City borough of Brooklyn, USA.
5 October 1839, New-York (NY) Commercial Advertiser, pg. 1, col. 8:
From the Long Island Star.
Governor Seward’s Visit.
One of the Gravesenders inquired if Gov. S. was born on Long Island.
7 November 1893, Hartford (CT) Courant, “The Gravesend Affair,” pg. 6:
According to the leading democratic newspaper of Brooklyn, it is 2000 in excess of the total number of male Gravesenders of voting age.
Gaynor, the Tammany mayor who swallowed the tiger:
Lawyer, Judge, Philosopher
By Louis H. Pink
New York, NY: International Press
To rebuke the political outlawry it was necessary to vote for Schieren and Gaynor. McKane though idolized by his Gravesenders had shot his bolt too far.
Brooklyn-- and how it got that way
By David W. McCullough
New York, NY: Dial Press
Some Gravesenders themselves might actually have been uneasy in their freedom.
The People’s Playground
By Michael Immers
Piscataway, NJ: Rutgers University Press
By the 1840s a sufficient number of excursionists were arriving by carriage to cause some misgivings among the Gravesenders.
By Joseph Ditta
Charleston, SC: Arcadia Pub.
Soon many Gravesenders moved on to other ventures.