the publications say that gods name translated from Hebrew is yaweh. So why not use that name?
Actually, WT goes further and admits that the true pronunciation of YHWH has been lost forever, but likely it could have been Yahweh (doesn't say much for god, does it? Couldn't even preserve his own name in his own book?).
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About the 13th century the term "Jehovah" appeared when Christian scholars took the consonants of "Yahweh" and pronounced it with the vowels of "Adonai." This resulted in the sound "Yahowah," which has a Latinized spelling of "Jehovah." The first recorded use of this spelling was made by a Spanish Dominican monk, Raymundus Martini, in 1270.
Interestingly, this fact is admitted in much Jehovah's Witness literature, such as their Aid to Bible Understanding (p. 885). This is surprising because Jehovah's Witnesses loathe the Catholic Church and have done everything in their power to strip their church of traces of Catholicism. Despite this, their group's very name contains a Catholic "invention," the name "Jehovah."
Jehovah's Witnesses blast orthodox Christendom for "hiding the name of God" by replacing "Jehovah" with "the Lord" whenever "Jehovah" appears in Scripture. They charge this is a Jewish "superstition" that dishonors God (which it does not). Yet their own organization has a name that was invented as a result of the same thinking that produced use of "the Lord."
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*** w50 12/1 pp. 472-473 An Open Letter to the Catholic Monsignor ***
".... We do not say that "Jehovah" is the correct pronunciation of God’s name...However, if you call it shallow scholarship for the Committee to use the word Jehovah in the New World Translation, then you will have to admit that it is due to the shallow scholarship of the Roman Catholic clergy of the thirteenth century, for in that century the word historically appears among them... the Spanish Dominican friar Raymundus Martini wrote his Pugio, about 1278, and used the name Jehovah."
So why does WT use "Jehovah" instead of the more accurate "Yahweh"? Tradition !!
Insight vol. 2 p. 5, Jehovah
"Jehovah" is the best known English pronunciation of the divine name, although "Yahweh" is favored by most Hebrew scholars