מַלְכִּי־צֶדֶקMalkîy-Tsedeq

proper name, masculine: king of שָׁלֵם (Genesis 14:18; Psalms 110:4)

Pronunciation: mal-kee-tseh'-dek · Hebrew/Aramaic (Old Testament) · H4442

Same root

מֶלֶךְmelek · H4428a king
צֶדֶקtsedeq · H6664the right (natural, moral or legal); also (abstractly) equity or (figuratively) prosperity
ΜελχισεδέκMelchisedék · G3198Melchisedek (i.e. Malkitsedek), a patriarch

Where it appears

Appears 4 times in the Bible.

Genesis 14:18 And Melchizedek, the king of Salem and a priest of God Most High, brought Abram some bread and wine.
Psalms 110:4 The Lord has taken an oath and will not break his vow: “You are a priest forever in the order of Melchizedek.”

See every passage

Genesis 14:18
Psalms 110:4

Source: Brown, Driver and Briggs, Hebrew and English Lexicon of the Old Testament (1906), public domain; markup by unfoldingWord, CC BY (github.com/unfoldingWord/Brown-Driver-Briggs-Enhanced).