The answer is yes. Melchizedek, as the king of Salem and priest of El Elyon, served Canaanites in his city and the surrounding area. El Elyon means "God Most High." It combines the word "god" with the honorific "most high."
El was also the name of the supreme deity in Canaanite mythology. He was the father of the gods and the head of the assembly of the god, also called the divine council. The epithet "elyon" (also spelled Aliyan) was also applied to other deities. From the myths of the Ba'al Cycle
Baal sets the season and gives forth His voice from the clouds. He
flashes lightning to the earth. As a house of cedars let Him complete
it, or a house of bricks let Him erect it! Let it be told to Aliyan
Baal: 'The mountains will bring Thee much silver.
Considering this, it is most probable that Elyon was one of many titles applied to the supreme deity El. Melchizedek would have worshiped him as the head of the divine assembly. Whether he also served other deities is not stated in the text, but Abram accepted El Elyon as being the same god as his own YHWH (the Lord). Gen. 14:22 - "I have sworn to the Lord, El Elyon, the creator of heaven and earth."
As priest-king of Canaan, Melchizedek's priesthood would have served the people of Salem and its environs. He also ministered to Abram when they shared a sacred meal together and Melchizedek blessed Abram as follows:
Genesis 14:19-20
“Blessed be Abram by El Elyon,
the creator of heaven and earth; And blessed be El Elyon,
who delivered your foes into your hand.”
Conclusion: Although this blessing is the only such benediction recorded, Melchizedek would have blessed many people of the region the in the name of El Elyon.