Melchizedek = "my king is righteousness"
melek = king
tsedeq = justice, rightness, righteousness

Genesis 14:18 NASB

And Melchizedek king of Salem brought out bread and wine; now he was a priest of God Most High.

Psalm 110:4 NASB95

The LORD has sworn and will not change His mind, "You are a priest forever According to the order of Melchizedek."

Hebrews 5:6, 10 NASB95

just as He says also in another passage, "YOU ARE A PRIEST FOREVER ACCORDING TO THE ORDER OF MELCHIZEDEK." ... being designated by God as a high priest according to the order of Melchizedek.

Hebrews 6:20 NASB95

where Jesus has entered as a forerunner for us, having become a high priest forever according to the order of Melchizedek.

Hebrews 7:1-3 NASB95

For this Melchizedek, king of Salem, priest of the Most High God, who met Abraham as he was returning from the slaughter of the kings and blessed him, to whom also Abraham apportioned a tenth part of all [the spoils,] was first of all, by the translation of his name, king of righteousness, and then also king of Salem, which is king of peace. Without father, without mother, without genealogy, having neither beginning of days nor end of life, but made like the Son of God, he remains a priest perpetually.

Hebrews 7:10 NASB95

for he was still in the loins of his father when Melchizedek met him.

Hebrews 7:11 NASB95

Now if perfection was through the Levitical priesthood (for on the basis of it the people received the Law), what further need [was there] for another priest to arise according to the order of Melchizedek, and not be designated according to the order of Aaron?

Hebrews 7:15 NASB95

And this is clearer still, if another priest arises according to the likeness of Melchizedek,

Hebrews 7:17 NASB95

For it is attested [of Him,] "YOU ARE A PRIEST FOREVER ACCORDING TO THE ORDER OF MELCHIZEDEK."

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Related
'Adoniy-Tsedeq = "my lord is righteous"
'adown = lord, master
tsedeq = justice, rightness, righteousness

Joshua 10:1 NASB

Now it came about when Adoni-zedek king of Jerusalem heard that Joshua had captured Ai, and had utterly destroyed it (just as he had done to Jericho and its king, so he had done to Ai and its king), and that the inhabitants of Gibeon had made peace with Israel and were within their land,