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                                                                            Hi, Derrick — 
                                                                            
                                                                           I would venture to say because we
                                                                                hold the Name sacred, and because
                                                                                no one knows for sure how to render
                                                                                It into English. 
                                                                           The Jews, being pious, at one point,
                                                                                ceased to pronounce the Divine Name.
                                                                                (This way, they were sure, not to
                                                                                use it vain.) This caused its vowels
                                                                                to be lost.  Until recently,
                                                                                vowels in Hebrew words were not written
                                                                                down; the consequence being that
                                                                                knowledge of how it was to be pronounced
                                                                                was lost. Some took the vowels from Adonai — which was always pronounced
                                                                                in place of the Divine Name when
                                                                                it was uttered — and applied
                                                                                them to the consonants. This is where
                                                                                the Jehovah Witnesses get Jehovah,
                                                                                but these were not the original vowels,
                                                                                so almost assuredly Jehovah is
                                                                                not the Divine Name. 
                                                                           On top of this, we can't even agree
                                                                                on the consonants. Jehovah Witnesses
                                                                                use (J and V) but most scholars today
                                                                                would use (Y and W).  
                                                                            However, the Jehovah Witness' own Aid
                                                                                to Bible Understanding says,  
                                                                           
                                                                                
                                                                                     "The first recorded use of
                                                                                          this form [Jehovah] dates from
                                                                                          the 13th century C.E. [after Christ].
                                                                                          Raymundus Martini, a Spanish monk
                                                                                          of the Dominican order, used it
                                                                                          in his book Pugeo Fidei of the
                                                                                          year 1270. Hebrew scholars generally
                                                                                          favor ‘Yahweh' as
                                                                                          the most likely pronunciation"  
                                                                                           
                                                                                          (pp. 884-885).  | 
                                                                                 
                                                                            
                                                                           Catholic Answers notes: 
                                                                           
                                                                                
                                                                                     'New Testament
                                                                                               Greek always uses the word Lord, and
                                                                                               never Jehovah, even in
                                                                                               quotes from the Old Testament (OT).
                                                                                               Encyclopedia Judaica, Webster's
                                                                                               Encyclopedia, Jewish Encyclopedia,
                                                                                               Encyclopedia Britannica, Universal
                                                                                               Jewish Encyclopedia and countless
                                                                                               others agree that the title Jehovah is
                                                                                               erroneous, grammatically impossible,
                                                                                               and was never used by the Jews.'  
                                                                                     — Stumpers for the Jehovah's Witnesses  | 
                                                                                 
                                                                            
                                                                           So
                                                                                the New Testament authors didn't
                                                                                think it was important to use God's
                                                                                Divine Name in their Scriptures. 
                                                                           Given how sacred the Name is, translators
                                                                                probably just don't bother to use
                                                                                a word whose details are so sketchy.  
                                                                           Eric 
                                                                            
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