The name "Jehovah's Witnesses" was taken from God's words to Israel recorded in Isaiah 43:10. For a Christian group to take on such a name clearly conflicts with the teachings of scripture. First, as mentioned, the words spoken by God recorded in Isaiah 43:10 were spoken to the nation of Israel, not to Christians. The Bible tells us that Christians are to be witnesses of Jesus just as the Jews were witnesses of Jehovah. Jesus said, "You will be witnesses of me." (Acts 1:8) And the Bible tells us that it was "by divine providence," by God's own direction, that His people in the post-Jewish age would be known by the name of Jesus Christ. (Acts 11:26 NWT) Thus, instructing Christians to identify themselves by the name "Jehovah's Witnesses" clearly conflicts with the teachings of scripture.
The fact of the matter is, the Watchtower Society's use of the name "Jehovah" is not scriptural. They have added the name "Jehovah" many times to the text of the New Testament even though they admit that, "…no early surviving Greek manuscript of the ‘New Testament’ contains the personal name of God." ( The Watchtower March 1, 1991 p. 28 ) The Watchtower Society has said that they believe that the writers of the New Testament used the divine name in their original writings but that their original writings were later corrupted. However this contradicts what the Society itself has said. The Society tells us that, "Jehovah God has seen to it that his Word has been protected not only from mistakes copyists made but also from attempts of others to make additions to it. The Bible itself contains God’s promise that his Word would be kept in a pure form for us today." ( You Can Live For Ever in Paradise on Earth, 1982 p. 53 ) So, Jehovah's Witnesses had no business inserting the name Jehovah into the New Testament portions of their New World Translations when that name is not found in any early surviving Greek manuscript of the New Testament.
Historians tell us that the personal name of God, as used in the Old Testament, was not used in either its written or spoken form for many years before the time of Christ. Because the Jews were afraid overuse of the divine name might amount to "taking the name of the Lord in vain," they actually forbid its use altogether. I believe God allowed this to happen in order to make way for the time which was coming, the time when He wanted the name of Jesus to be promoted above every name. (Phil. 2:9)
Jehovah's Witnesses do not do this. Their putting the name Jehovah into the New Testament portions of their New World Translations and promoting that name above every name, rather than the name of Jesus as the Bible says Christians should be doing, is one of many things which show that Jehovah's Witnesses are not really Christians.