As their name shows, Jehovah’s Witnesses are Witnesses for Jehovah. Who is Jehovah? Jehovah is the name that Almighty God gives to himself in the pages of the Bible. It is a personal name, not a title like God or Lord. In a general sense, throughout history anyone who witnesses to God’s glory could be called a witness of Jehovah.—Exodus 3:13, 15; Isaiah 43:10.
It is a descriptive name, indicating that they bear witness concerning Jehovah, his Godship, and his purposes. “God,” “Lord,” and “Creator”—like “President,” “King,” and “General”—are titles and may be applied to several different personages. But “Jehovah” is a personal name and refers to the almighty God and Creator of the universe. This is shown at Psalm 83:18, according to the "King James version" of the Bible: “That men may know that thou, whose name alone is JEHOVAH, art the most high over all the earth.”
The name Jehovah (or Yahweh, as the Roman Catholic Jerusalem Bible and some scholars prefer) appears almost 7,000 times in the original Hebrew Scriptures. Most Bibles do not show it as such but substitute “God” or “Lord” for it. However, even in these Bibles, a person can usually tell where the original Hebrew text uses Jehovah because in those places the substituted words are written in large and small capitals, thus: GOD, LORD. Several modern translations do use either the name Jehovah or the name Yahweh. Hence, the New World Translation reads at Isaiah 42:8, “I am Jehovah. That is my name.”
The Scriptural account that Jehovah’s Witnesses draw on for their name is in the 43rd chapter of Isaiah. There the world scene is viewed as a courtroom drama: The gods of the nations are invited to bring forth their witnesses to prove their claimed cases of righteousness or to hear the witnesses for Jehovah’s side and acknowledge the truth. Jehovah there declares to his people: “Ye are my witnesses, saith Jehovah, and my servant whom I have chosen; that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me. I, even I, am Jehovah; and besides me there is no saviour.”—Isaiah 43:10, 11, "American Standard Version."
Jehovah God had witnesses on earth during the thousands of years before Jesus was born. After Hebrews chapter 11 lists some of those men of faith, Hebrews 12:1 says: “So, then, because we have so great a cloud of witnesses surrounding us, let us also put off every weight and the sin that easily entangles us, and let us run with endurance the race that is set before us.” Jesus said before Pontius Pilate: “For this I have been born, and for this I have come into the world, that I should bear witness to the truth.” He is called “the faithful and true witness.” (John 18:37; Revelation 3:14) Jesus told his disciples: “You will receive power when the holy spirit arrives upon you, and you will be witnesses of me both in Jerusalem and in all Judea and Samaria and to the most distant part of the earth.”—Acts 1:8.
Hence, over 6,800,000 persons today who are telling the good news of Jehovah’s Kingdom by Christ Jesus in over 230 lands feel that they properly refer to themselves as Jehovah’s Witnesses.
For further information & learn more - you may wish to get in touch with Jehovah's Witnesses at the local Kingdom Hall. Or: <watchtower.org>