In day's gone past, the WTS/GB made a big point that it not should be "Jehovah's Witnesses" but "one of Jehovah's witnesses" (because it should not like a religion's name) and if Jehovah's Witnesses were used, the "w" should be lower case, Jehovah's witnesses.
1968 Note how they used a lower case w, but also they said that in 1917 that there were Jehovah's witnesses, but that name was not take on by the WTS until 1931.
By 1917 Jehovah’s witnesses had clearly seen that Matthew 24:7, 8 was having fulfillment. Nation had risen against nation.
1975
About the same time that Kingdom Farm had been the object of threatened assault and arson, trouble flared up against Jehovah’s witnesses in Litchfield, Illinois.
and also this appellation
1971
They were Jehovah’s Christian witnesses now because they had faith in God’s Son, Christ Jesus, who redeemed them from death, and they believed in the kingdom of God.
around 1990
Eventually the WTS dropped "Jehovah's Christian witnesses" because some outside group copyrighted the name "Jehovah's Christian Witnesses."
https://www.jehovahs-witness.com/topic/78640/jehovahs-christian-witnesses
Which is why the WTS changed to the Christian Congregation of Jehovah's Witnesses
January 1, 2001 (2002 Kingdom Ministry
the Governing Body has approved the formation of additional corporations to care for certain needs of Jehovah’s Witnesses here in the United States. The new corporations are as follows:
Christian Congregation of Jehovah’s Witnesses