JWGoneBad...They actually mention Martini few times. They contradict:
Divine Name Brochure....In time, God’s name came back into use. In 1278 it appeared in Latin in the work Pugio fidei (Dagger of Faith), by Raymundus Martini, a Spanish monk. Raymundus Martini used the spelling Yohoua.
WT 1980 Interestingly, Raymundus Martini, a Spanish monk of the Dominican order, first rendered the divine name as “Jehova.” This form appeared in his book Pugeo Fidei, published in 1270 C.E.—over 700 years ago.
Aid book: By combining the vowel signs of ʼAdho·nayʹ and ʼElo·himʹ with the four consonants of the Tetragrammaton the pronunciations Yeho·wahʹ and Yeho·wihʹ were formed. The first of these provided the basis for the Latinized form “Jehova(h) (In the 16th century).” The first recorded use of this form dates from the thirteenth century C.E. Raymundus Martini, a Spanish monk of the Dominican Order, used it in his book Pugeo Fidei of the year 1270.
Blotty you might find that last one interesting. The vowels were long known to be from Masoretic vowel points.