In the Septuagint version of the Old Testament, the Greek word used for the Hebrew word Jehovah, as well as the frequent name God, is given as Adhon, meaning “Lord.”
Adonai (Heb. Adhon or Adhonay) means “lord” or “master” and is usually translated “Lord” in English Bibles.
Adonai should be understood to mean “Lord of all” (Deut. 10:17), it is not God’s name.
The word “Adonai” is used in Judaism as a spoken substitute for the ineffable (incapable of being expressed; indescribable or unutterable) name of God.