giordano is quite mistaken.
Jehovah is an adequate transliteration of the divine name into English.
Just like Elijah is correct.
Just like Jeremiah is correct.
Just like Joshua/Jehoshua is correct.
Just like Judah/Jehudah is correct.
As a matter of fact there is only one letter difference between Judah's name and the tetragram.
YHWDH is Judah which was pronounced according to its letters like YeHooDaH, and if you take that D out, you are left with the tetragram which should be pronounced then like Ye-Hoo-aH according to its Hebrew letters..
Write it as it would sound in Latin letters and you end up with Iehovah, since the letter I was like our English Y, and the V was like a W or OO sound.
In English spelling this became traditionally spelled with a J like so many other Bible names.