“Themhattan” (them + Manhattan) is a jocular name to get the “man” out of the borough of “Manhattan.”
   
“I am offended by this. It should clearly by Theyhattan or Themhattan” was posted on Twitter by “Hunt and Snare” on May 7, 2017. “breaking news: the borough of manhattan announced it will now be named they/themhattan” was posted on Twitter by Merm Aids on December 18, 2017. “In 2019 we’re calling it Themhattan” was posted on Twitter by leeeela on January 1, 2019. “In the future. Manhattan to be renamed Themhattan” was posted on Twitter by Gus on July 19, 2019.
     
“Theyhattan” (they + Manhattan) is a similar term.
 
       
Wikipedia: Manhattan
Manhattan (/mænˈhætən, mən-/), known regionally as The City, is the most densely populated and geographically smallest of the five boroughs of New York City. It is the urban core of the New York metropolitan area, and coextensive with New York County, one of the original counties of the U.S. state of New York. Manhattan serves as the city’s economic and administrative center, cultural identifier, and historical birthplace. The borough consists mostly of Manhattan Island, bounded by the Hudson, East, and Harlem rivers along with several small adjacent islands, including Roosevelt, U Thant, and Randalls and Wards Islands.
(...)
Etymology
The name Manhattan derives from the Munsee Lenape language term manaháhtaan (where manah- means “gather”, -aht- means “bow”, and -aan is an abstract element used to form verb stems). The Lenape word has been translated as “the place where we get bows” or “place for gathering the (wood to make) bows”.
         
Twitter
Hunt and Snare
@HuntAndSnare
Replying to @AjinArts
I am offended by this. It should clearly by Theyhattan or Themhattan
6:08 PM · May 7, 2017·TweetDeck
 
Twitter
Merm Aids
@AidsMerm
breaking news: the borough of manhattan announced it will now be named they/themhattan
11:41 PM · Dec 18, 2017·Twitter for iPhone
   
Twitter
fagu3tt3
@fagu3tt3
Faguette is proudly petite obese in they/themhattan
4:51 PM · Apr 20, 2018·Twitter for iPhone
 
Twitter
leeeela
@frizzfatale
In 2019 we’re calling it Themhattan
6:46 PM · Jan 1, 2019·Twitter for iPhone
 
Kitchen Connection
MONDAY, JUNE 24, 2019
MADE IN THEMHATTAN
Another absurd brain explosion has struck the over-zealous, gender-neutral, politically-correct “pundits”, who are, apparently, multi-taskers with far too much spare time on their hands.  Simultaneously, they waste energy, jump up and down, brandish posters, flap their gums, and wave their arms in the air.
(...)
Manhattan, as shown in the above title will disappear; ferried across to Staten Island.
       
Twitter
Gus
@Gus_802
Replying to @nytimes and @loridroste
In the future.
Manhattan to be renamed Themhattan.
3:49 PM · Jul 19, 2019·Twitter Web App
   
Twitter
isa medina
@isaamedinaa_
i heard the libs are changing it from MANhattan to THEY/THEMhattan 😤
6:39 PM · Nov 19, 2020·Twitter for iPhone
     
Twitter
whit
@whitneywegnerr
manhattan.. more like womanhattan and they/themhattan
12:46 AM · Dec 12, 2020·Twitter for iPhone
 
Twitter
🇺🇸 ☮️🧡🌈
@TimCoxComedy
Brooklynites now call it “Themhattan”
11:59 PM · Dec 14, 2020·Twitter for iPhone
 
Twitter
minty. 🐧
@PeppermintFlyBy
liberals want to turn manhattan into they/themhattan
12:37 AM · Oct 12, 2021·Twitter Web App
       
Twitter
Jean (Eastern eruopean Bladee)
@EnjoyYourJean
manhattan??? YOU MEAN THEY/THEMHATTAN>???>
9:21 AM · Dec 5, 2021·Twitter Web App
   
Twitter
danielle 🫎 moosy
@zeekyhbomb
woke nyc be like they/themhattan
1:42 PM · Dec 15, 2021·Twitter for Android
 
Twitter
The CEO
@TheCEO_OfficiaI
the liberals want to change Manhattan to They/Themhattan
2:44 PM · Dec 31, 2021·Twitter for iPhone
 
Twitter
prodbycrusty from the fedboii kez album
@fakepatek
the liberal left media wants to turn manhattan into they/themhattan
8:04 PM · Jun 7, 2022·Twitter for iPhone
   
Twitter
ThegreatBarbossa
@ThegreatBarbos1
Replying to @alxmalloy
The wokes turned manhattan into they/themhattan
4:04 AM · Jun 13, 2022·Twitter for Android
 
Twitter
sam🪲
@samreineking
THE LIBRALS WANT TO TURN MANHATTAN INTO THEY/THEMHATTAN!
9:48 AM · Jun 13, 2022·Twitter for iPhone
 
Twitter
Lauren Masters 🕯🇺🇸
@SarahKWilliam
Themhattan
Quote Tweet
Sydney Watson
@SydneyLWatson
·
Aug 20
I feel bad for the citizens of Theyhattan
7:20 PM · Aug 20, 2022·Twitter for iPhone
 
Twitter
daniel cox
@5dancox
Replying to @SydneyLWatson and @PaganF56
Themhattan?
Hattan?
Ithattan?
None of it has the same ring. I think this is a mistake.
9:43 AM · Aug 22, 2022·Twitter for Android