“Fort Worther” is the name of an inhabitant of Fort Worth, Texas. The name “Fort Worther” has been cited in print since at least 1886.
An inhabitant of Fort Worth has also been called a “Fort Worthian” (cited in print since at least 1882).
Wikipedia: Fort Worth, Texas
Fort Worth is the 16th-largest city in the United States of America and the fifth-largest city in the state of Texas. Located in North Central Texas, just southeast of the Texas Panhandle, the city is a cultural gateway into the American West and covers nearly 300 square miles (780 km2) in Tarrant, Parker, Denton, and Wise counties, serving as the seat for Tarrant County. According to the 2010 Census, Fort Worth had a population of 741,206. It has been estimated that by 2030 it will have 1,211,665 residents. The city is the second most populous in the Dallas–Fort Worth metropolitan area.
The city was established in 1849 as an Army outpost on a bluff overlooking the Trinity River. Today Fort Worth still embraces its Western heritage and traditional architecture and design.
Demonym Fort Worthians
The Portal to Texas History
18 June 1886, Hempstead (TX) Ledger, pg. 2, col. 1:
It costs money, and lots of it, to run a live paper, but the Fort Worthers put it up, and instead of grumbling regard it as a good investment.—Galveston Tribune.
29 February 1895, San Antonio (TX) Light, “Cycle Brevities,” pg. 3, col. 3:
Tackaberry, the fast Fort Worther, carried off several trophies during the Boeville fair.
28 September 1902, Fort Worth (TX) Telegram, pg. 14, col. 5 ad:
WANTED—Fort Worthers to know that the celebrated Carriso Water can now be had in any quantity from the live and up-to-date dealers, Childers & Coulson and C. E. Momand & Co.
OCLC WorldCat record
The Fort Worther.
Publisher: Fort Worth, Tex. : Campbell Co.
Edition/Format: Journal, magazine : Periodical : English
Garner’s Modern American Usage
By Bryan A. Garner
New York, NY: Oxford University Press
Fort Worth…Fort Worthian, Fort Worther