Adon literally means "lord." Adon has an uncertain etymology, although it is generally believed to be derived from the Ugaritic ad, “father.”
The pluralization of Adoni "my lord" is Adonai "my lords."Otto Eissfeldt theorizes that Adonai is a post positive element attested to in Ugaritic writing. He points to the myth of the struggle between Baal and Yam as evidence. Some theorize that Adonai was originally an epithet of the god Yahweh depicted as the chief antagonist of "the Ba`als" in the Tanakh. Only later did the epithet come to be used as an euphemism to avoid invoking the deity's proper name, Yahweh.
In Canaanite/Ugaritic tradition, ʾadn ilm, literally "lord of gods" is an epithet of El. However, ʾadn "lord" could also be an epithet of other gods. When Yam is described as being at the zenith of his might, he is proclaimed ʾadn or "lord" of the gods. In some Ugaritic texts the term ʾadn ʾilm rbm meaning "the Lord of the Great Gods" is used to refer to the lord and father over deceased kings Some think that this is a reference to Baal. Other suggest this is a reference to a human necromancer traveling to the land of the dead. Karel van der Toorn disagrees he believes that it is a reference to Milku, Yaqar or Yarikh or possibly ElUgarit family households were modeled after the structure of the divine world, each headed by an ʾadn meaning in this context "master" or "patron". Generally, this was the patriarch of the family and there may be some relation between ʾadn and the Ugarit word for "father", ʾad.
The name of the Greek god Adonisis similar to a Semitic word—adon (which means "lord"). Yet there is no trace of a Semitic deity directly connected with Adonis, and no trace in Semitic languages of any specific mythemes connected with his Greek myth; both Greek and Near Eastern scholars have questioned the connection.