Dating jehovah single witness
Sheva and hataf-patah were allophones of the same phoneme used in different situations: hataf-patah on glottal consonants including aleph (such as the first letter in Adonai), and simple sheva on other consonants (such as the Y in YHWH).
The Brown-Driver-Briggs Lexicon suggested that the pronunciation Jehovah was unknown until 1520 when it was introduced by Galatinus, who defended its use.
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The derived forms Iehouah and Jehovah first appeared in the 16th century.
The consensus among scholars is that the historical vocalization of the Tetragrammaton at the time of the redaction of the Torah (6th century BCE) is most likely Yahweh.
The historical vocalization was lost because in Second Temple Judaism, during the 3rd to 2nd centuries BCE, the pronunciation of the Tetragrammaton came to be avoided, being substituted with Adonai ("my Lord").
The Authorized King James Version, which used "" as the equivalent of the Tetragrammaton.
The name Jehovah appeared in John Rogers' Matthew Bible in 1537, the Great Bible of 1539, the Geneva Bible of 1560, Bishop's Bible of 1568 and the King James Version of 1611.