The four letters of the Tetragrammaton is: Iod, He, Vau, He
It was Not first-century Christians [early disciples] that replaced the Tetragrammaton with Kyrios or Theos in the Septuagint. Persons after the first century ended did that when the foretold apostasy developed. Luke forewarned wolf-like clergy dressed in sheep's clothing would fleece the flock of God at Acts 20vs29,30. Also 2nd Thess 2vs2-8; 1st Tim 4v1.
The codex Leningrad B 19a has the Tetragrammaton as Yehwah', Yehwih' and Yehowah.
Although Hebrew scholars favor Yahweh as a likely pronunciation others favor Yahuwa, Yahuah, or even Yehuah.
One Jewish professor mentioned to me a favoring of three syllables.
That would favor Ye.ho.wah.
Also in the Hebrew spelling of names such as Jehoshaphat, Joshaphat, Shepatiah contain forms of Yehoh, Yoh, Yah, and Ya'hu.
Even in the Greek, Iaoue and Iabe pronounced in Greek resemble Yahweh.
We do not generally use the Hebrew for Jeremiah [ Yirmeyah] or Isaiah [ Yeshayahu].
We do not generally use Yehoshua the Hebrew for Jesus, or Iesous the Greek for Jesus.
Jesus name corresponding to the Hebrew in English means: Jehovah is salvation.
Please notice KJV at Psalm 110v1. There are two [2] LORD/Lord's mentioned.
Where LORD is in all uppercase letters is where the Tetragrammaton stood.
Lord [not in all capital letters] is in reference to Jesus not the Tetragrammaton.