“Brimaquonx” (Brooklyn + Staten Island + Manhattan + Queens + Bronx) was once suggested as the name for New York City. The proposed name is known largely through a mention in Mario Pei’s The Story of Language (1952).
 
         
Google Books
The Story of Language
Author: Mario Pei
London: Allen & Unwin
1952
Pg. 68:
A name has been suggested for New York City that would combine elements of the names of all the boroughs, but fortunately it failed to take hold: Brimaquonx.
   
Google Books
Galaxy Magazine
Volume 9, Issues 1-6
1954
Pg. 5:
Brimaquonx was once seriously suggested — and not in science fiction — as a name for New York that would combine those of all the boroughs.
         
Wikipedia:Articles for deletion/Log/2008 October 18
My personal favorite portmanteau was “Brimaquonx” to describe New York City, something that Mario Pei repeated in his book The Story of English. The reason for a deletion is that for a topic to get a “page” of its own, it has to pass a test of notability, which is usually defined in terms of coverage by reliable and verifiable sources that can be cited in order to respond to the skeptical reader.
Mandsford (talk) 00:56, 19 October 2008 (UTC)
 
Telegraph (London)
QI: Quite interesting facts about New York
A quietly intriguing column from the brains behind QI, the BBC quiz show. This week: QI loves New York
Compiled by Molly Oldfield & John Mitchinson
6:02PM GMT 17 Mar 2011
(...)
Brimaquonx
It was once suggested that New York should be called Brimaquonx, which rolls the names of all its boroughs into one, (Brooklyn, Staten Island, Manhattan, Queens, Bronx).