The Tetragrammaton
The name of God in Judaism used most often in the Hebrew Bible is the four-letter name יהוה (YHWH), also known as the Tetragrammaton. The Tetragrammaton appears 6,828 times in the Biblia Hebraica Stuttgartensia edition of the Hebrew Masoretic Text. It is first mentioned in the Genesis 2:4 and is traditionally translated as The L in English language Bibles.
The Hebrew letters are (right to left) Yodh, He, Waw and He (יהוה). It is written as YHWH, YHVH, or JHVH in English, depending on the transliteration convention that is used. YHWH is an archaic third person singular imperfect of the verb "to be" (meaning, therefore, "He is"). This interpretation agrees with the meaning of the name given in Exodus 3:14, where God is represented as speaking, and hence as using the first person ("I am"). It stems from the Rabbinic conception of monotheism that God exists by himself for himself, and is the uncreated Creator who is independent of any concept, force, or entity ("I am that I am").
The Tetragrammaton was written in contrasting Paleo-Hebrew characters in some of the oldest surviving square Aramaic Hebrew texts, and were not read as Adonai ("My Lord") until after the Rabbinic teachings after Israel went into Babylonian captivity. Because Judaism forbids pronouncing the name outside the Temple in Jerusalem, the correct pronunciation of the Tetragrammaton may have been lost, as the original Hebrew texts only included consonants. The prohibition of blasphemy, for which capital punishment is prescribed in Jewish law, refers only to the Tetragrammaton (Soferim iv., end; comp. Sanh. 66a).
Read more about this topic: Names Of God In Judaism