Searching on the 2012 cd rom I found this
*** na pp. 17-18 God’s Name and Bible Translators ***
God’s Name and Bible Translators
Raymundus Martini used the spelling Yohoua. Soon after, in 1303, Porchetus de Salvaticis completed a work entitled Victoria Porcheti adversus impios Hebraeos (Porchetus’ Victory Against the Ungodly Hebrews). In this he, too, mentioned God’s name, spelling it variously Iohouah, Iohoua and Ihouah. Then, in 1518, Petrus Galatinus published a work entitled De arcanis catholicae veritatis (Concerning Secrets of the Universal Truth) in which he spells God’s name Iehoua.
The name first appeared in an English Bible in 1530, when William Tyndale published a translation of the first five books of the Bible. In this he included the name of God, usually spelled Iehouah, in several verses, and in a note in this edition he wrote: “Iehovah is God’s name . . . Moreover as oft as thou seist LORD in great letters (except there be any error in the printing) it is in Hebrew Iehovah.” From this the practice arose of using Jehovah’s name in just a few verses and writing “LORD” or “GOD” in most other places where the Tetragrammaton occurs in the Hebrew text.
What I haven't discovered yet is the reason why the name Jehovah was inserted where it wasn't before in the New Testament