"What Have Jehovah's Witnesses Witnessed?" - Where Does the Name "Jehovah's Witnesses" Come From?

Many people who wish to ridicule Jehovah's Witnesses often resort to asking the same old, childish question: "What Have Jehovah's Witnesses Witnessed?"

However, this question may prompt some to consider a legitimate and somewhat related question, "Where Does the Name "Jehovah's Witnesses" Come From?"

The key here is to understand exactly what "witness" means in this context.

According to the Theological Dictionary of the New Testament, "the concept of witness [is used] both in the sense of witness to ascertainable facts and also in that of witness to truths, i.e., the making known and confessing of convictions." So a witness relates facts from direct personal knowledge, or he proclaims views or truths of which he is convinced.

So a "Witness" is someone that speaks publically about what he knows to be true. Of course no human has ever literally seen God (John 1:18), but Jehovah's Witnesses realize that God has asked his faithful servants to be His Witnesses and to tell others about Him:

"Ye are my witnesses, saith Jehovah, and my servant whom I have chosen;" (Isa. 43:10) - ASV

Isa. 43:10 also corresponds with Acts 15:14 where it says that God will turn "his attention to the nations to take out of them a people for his name." (NWT)

According to the Bible, the line of Witnesses of Jehovah reaches back to faithful Abel. Hebrews 11:4-12:1 mentions this line as a "great a cloud of WITNESSES surrounding us."

The Bible says that Jesus Christ was the foremost witness of Jehovah: "These are the things that the Amen says, the faithful and true witness, the beginning of the creation by God." (Rev. 3:14) Considering the definition of "witness" mentioned above, Jesus said that it was his Father's name that he made manifest. (John 17:6)

For more, see:
How We Came to Be Known as Jehovah’s Witnesses (Pastor Russell)

Why does the New World Translation 'add' the words, within square brackets, "the angel of" at Zechariah 3:2?

All Bible translations add words to make the intended meaning of the original language clear to the readers of another language. Some Bibles indicate the added words in footnotes. Some, like the King James Version, frequently signifies these additions by italicizing such added words. The New World Translation usually indicates added words with brackets [ ].

In the case of Zechariah 3:2, the New World Translation is not the only Bible to add "the angel of" or its equivalent here.

A New Commentary on Holy Scripture explains their reason why:

"[v]2. the Lord. Read the angel of the Lord, as the speech that follows seems to require."- SPCK, London, reprint 1946 (1st pub.1928).

Another footnote, this one belonging to The Revised English Bible (1989) reveals why it reads at Zechariah 3:2 "The angel said to Satan." The footnote states: "3:2 angel: prob[able] r[ea]d[in]g, so Syriac; Heb[rew] LORD." (Additions in square brackets aim to aid in better understanding.)

This is similiar to what we can read in the footnote to this verse in the Reference Edition of the New World Translation (1984): "2* "The angel (messenger) of Jehovah," Sy[riac]; MLXXVg, "Jehovah."
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Other translations that render this passage the same way as the New World Translation:

"The angel of the Lord said to Satan," (Good News Translation)

"The angel of Yahweh said to Satan," (The Jerusalem Bible; Scroll down)
"And the angel of the LORD..." (New American Bible)

"The LORD rebuke you," the Angel of the LORD said..." (The Holy Bible, An American Translation; W.F. Beck)
"The messenger of Yahweh..." (vs.1) (The Emphasised Bible; J. B. Rotherham)
"Then [the messenger] of Jehovah..." (2001 Translation – An American English Bible)

"So the angel of the LORD said...." (The Bible, An American Translation; Powis-Smith and Goodspeed)