God is not a name. God is a title. The Bible calls the God of Abraham, Isaac and Jacob by many different names, and these names tell us something about his character. The full list is in this article: https://www.gotquestions.org/names-of-God.html
The various names/titles of God were initially written in Hebrew. Here are a few significant names:
ELOHIM [el-oh-heem]: God “Creator, Mighty and Strong” (Genesis 17:7; Jeremiah 31:33) – the plural form of Eloah, which accommodates the doctrine of the Trinity. From the Bible’s first sentence, the superlative nature of God’s power is evident as God (Elohim) speaks the world into existence (Genesis 1:1).
ADONAI [ˌædɒˈnaɪ; ah-daw-nahy]: “Lord” (Genesis 15:2; Judges 6:15) – used in place of YHWH, which was thought by the Jews to be too sacred to be uttered by sinful men. In the Old Testament, YHWH is more often used in God’s dealings with His people, while Adonai is used more when He deals with the Gentiles.
YHWH / YAHWEH / JEHOVAH [yah-way / ji-hoh-veh]: “LORD” (Deuteronomy 6:4; Daniel 9:14) – strictly speaking, the only proper name for God. Translated in English Bibles “LORD” (all capitals) to distinguish it from Adonai, “Lord.” The revelation of the name is given to Moses “I Am who I Am” (Exodus 3:14). This name specifies an immediacy, a presence. Yahweh is present, accessible, near to those who call on Him for deliverance (Psalm 107:13), forgiveness (Psalm 25:11) and guidance (Psalm 31:3).
When God spoke to Moses He introduced himself as
I AM WHO I AM. This is what you are to say to the Israelites: ‘I AM has sent me to you’ (Exodus 3:14).
The phrase translated “I am who I am” in Hebrew is ehyeh asher ehyeh. The word ehyeh is the first person common singular of the verb to be. It would be used in any number of normal situations: “I am watching the sheep,” “I am walking on the road,” or “I am his father.” However, when used as a stand-alone description, I AM is the ultimate statement of self-sufficiency, self-existence, and immediate presence. God’s existence is not contingent upon anyone else. His plans are not contingent upon any circumstances. He promises that He will be what He will be; that is, He will be the eternally constant God. He stands, ever-present and unchangeable, completely sufficient in Himself to do what He wills to do and to accomplish what He wills to accomplish. Source: https://www.gotquestions.org/I-AM-WHO-I-AM-Exodus-3-14.html
Due to a fear of accidentally taking God’s name in vain (Leviticus 24:16), the Jews basically quit saying it out loud altogether. Instead, when reading Scripture aloud, the Jews substituted the tetragrammaton YHWH with the word Adonai (“Lord”). Even in the Septuagint (the Greek translation of the Old Testament), the translators substituted Kurios (“Lord”) for the Divine Name. Eventually, the vowels from Adonai (“Lord”) or Elohim (“God”) found their way in between the consonants of YHWH, thus forming YaHWeH. But this interpolation of vowels does not mean that was how God’s name was originally pronounced. In fact, we aren’t entirely sure if YHWH should have two syllables or three. Source: https://www.gotquestions.org/YHWH-tetragrammaton.html
