מלכי–צדק Melchizedek = "my king is righteousness"
מֶלֶךְ melek = king
צֶדֶק 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.

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Related
אֲדֹֽנִי־צֶדֶק 'Adoniy-Tsedeq = "my lord is righteous"
אָדוֹן 'adown = lord, master
צֶדֶק 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,