The Houston Daily Post, September 20, 1897 (Before The 20th Century) 

NEGRO WHO CAN WRITE HEBREW:

Source: https://texashistory.unt.edu/ark:/67531/metapth84284/?q=Houston%20Daily%20post 

Direct Quotations. 

“A young African negro has been in this city for the last few days who claims to be a HEBREW. He is deaf and dumb and as BLACK as the ace of spades. He carries a pad of paper with him and answers all questions by writing them in Hebrew and LOSCHEN KHODISH. What excites the most wonder is that he writes Loschen Khodish very rapidly. It is the language of the books of Moses, and is made a special study of, spoken and written with ease ONLY by the rabbis and HIGHLY EDUCATED Hebrews.

“The negro was sent to one of the rabbis of Hartford, who is perfectly satisfied that he is a Hebrew. He says that he came from a large town in AFRICA, where there is a tribe of about 20,000 BLACK HEBREWS who speak LOSCHEN KHODISH and are quite prosperous. He also says that his father is a rabbi in that town, and that is why his father took the trouble to teach him to write these languages, which needed an extra amount of labor on account of his being deaf and dumb”.

“He says his people not only write Loschen Khodish, but it is their SPEAKING LANGUAGE as well. He left home a few years ago and has seen a good deal of the world. In each town he hunts up the Jewish section, and there they give him clothes, food and money. “What surprises him, he writes, is that NO Hebrew knows of his countrymen in AFRICA.”

It is Noteworthy to mention, the term Lashon Kodesh (often rendered in older English spellings like “Loschen Khodish” or “Lashawan Qadash”) is frequently dismissed today as a fabricated or modern invention associated with 20th-century Hebrew Israelite movements. However, the existence of an 1897 newspaper article which utilizes the term, demonstrates that the expression itself predates those movements and was already in circulation in the 19th century. Far from describing it as a newly invented dialect, the article presents it as the sacred Hebrew language — something regarded as known primarily by rabbis and highly educated Hebrews. The historical record shows that the phrase itself was not a 20th-century creation, but an older designation for Hebrew that had already entered English print long before modern identity debates emerged.

(Example Of Script

𐤀𐤁𐤂𐤃𐤄𐤅𐤆𐤇𐤈𐤉𐤊𐤋𐤌𐤍𐤎𐤏𐤐𐤑𐤒𐤓𐤔𐤕𐤘𐤙)

Source:

https://www.deadseascrolls.org.il/explore-the-archive/image/B-295277 

(To view description shown in the image above click this link, Paleo Leviticus is the 4th DSscroll down https://www.deadseascrolls.org.il/featured-scrolls)

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Proof That The pronunciation "Yahawa'shai" and "Yahawah" known as the Lashawan Qadash Dialect Is Ligitimate Hebrew 

Important Vocabulary term;

"The Arabic script (and similarly Hebrew, Aramaic, Pahlavi...) is an impure Abjad. These writing systems represent short consonants and long vowels using full letter graphemes, but generally omit short vowels and consonant length from writing. This leaves the task of inferring the missing phonemes to the reader by using context from neighbouring words and knowledge of the language structure to determine the correct pronunciation and disambiguate the meaning of the text."

(Reference; Deep Diacritization: Efficient Hierarchical Recurrence for Improved Arabic Diacritization
Badr AlKhamissi, Muhammad N. ElNokrashy, and Mohamed Gabr
The American University in Cairo (AUC)
2Microsoft Egypt Development Center (EGDC) Pp. Introduction)

(Scholastic Article; https://arxiv.org/pdf/2011.00538.pdf)

The point of this source is to demonstrate how the pronunciation of written words within an impure abjad (Modern hebrew), is predicated upon the readers inference of missing phonemes, For instance The name "Yahweh" is spelled in the tetragrámmaton as Y H W H

the "a" and "e" Are not definitively expressed in the written name. Only with the adding of diacritical marks, (Inference of the masoretic scribes interpreted by modern linguists), does the name definitively become "Yahweh". Paleo Hebrew by technicality is a Pure abjad. Diacritical Marks are Not original to the most ancient hebrew text, thus by extension, would make the pronounciation "Yahweh" disingenuous to the original Hebrew.

NOTE: Both abjad and impure abjad writing systems constitute Guess work or an inference that has to be made. The difference is that one (impure abjad) consists of Vowels, Optional diacritics or both (an inference established by masoretes in this case) , And the other (Pure abjad) consists of only consonants and NO vowels (Inference of vowel sounds are left to the interpreter) 

This scholastic Source Validates The Pronunciation "Yahawah" and Debunks the possibility of the pronunciation "Yahweh" Verbatim. It also cites a school of thought presented in 19th century linguistic scholarship, which proposes the pronunciation "Yahawah" as the true pronunciation of God's name.

(Yeho is pronounced Yahow/Yahau)