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Yahweh, name for the God of the Israelites, representing the biblical pronunciation of “YHWH,” the Hebrew name revealed to Moses in the book of Exodus. The name YHWH, consisting of the sequence of consonants Yod, Heh, Waw, and Heh, is known as the tetragrammaton.
After the Babylonian Exile (6th century BCE), and especially from the 3rd century BCE on, Jews ceased to use the name Yahweh for two reasons. As Judaism became a universal rather than merely a local religion, the more common Hebrew noun Elohim (plural in form but understood in the singular), meaning “God,” tended to replace Yahweh to demonstrate the universal sovereignty of Israel’s God over all others. At the same time, the divine name was increasingly regarded as too sacred to be uttered; it was thus replaced vocally in the synagogue ritual by the Hebrew word Adonai (“My Lord”), which was translated as Kyrios (“Lord”) in the Septuagint, the Greek version of the Hebrew Scriptures.
https://www.britannica.com/topic/Yahwist-source