Why is Elyon translated as the Most High God?
Elyon in Hebrew ordinarily means "the highest" or "the most high." When elevated to a capital title in the realm of deity, it becomes God's title, the Most High God. This pattern applies to many divine titles: common Hebrew words become unique and special when applied to God.
Les teaches that the term is El Elyon. In the Hebrew, the ordinary word Elyon simply means the highest, or the most high. But when it is elevated to the capital like this, it equals God's title of the Most High God. He notes that many titles of deity work this way: in ordinary vernacular they are just another Hebrew word, but when elevated into the realm of deity, they become unique and special. In the context, Melchizedek is called the priest of the Most High God, king of Salem, the city of peace, later known as Jerusalem.
And Melchizedek king of Salem brought forth bread and wine: and he was the priest of the most high God.