I think I've got it now.
Jeremiah 23:5, 6 Added [ ]
“Look! The days are coming [prophecy],” declares Jehovah, “when I will raise up to David a righteous sprout [Jesus; see Isa. 11:1; “stump” of Jesse, King David’s father*]. And a king [Jesus] will reign and show insight and uphold justice and righteousness in the land. 6 In his days Judah will be saved, and Israel [faithful Christianized Jews and Gentiles] will reside in security. And this is the name by which he [Jesus] will be called: Jehovah Is Our [his collective of followers] Righteousness.**”
The “our” (plural) is the collective body of Christianized Jews and Gentiles, God’s people, serving in unity under the King from the Royal line of David via Jesse, King David’s father (Isa 11:1).
Jeremiah 33:14, 15 NWT
“‘Look! The days are coming,’ declares Jehovah, ‘when I will fulfill the good promise that I have spoken concerning the house of Israel and the house of Judah. 15 In those days and at that time I will cause to sprout for David a righteous sprout [Jesus], and he will execute justice and righteousness in the land.
*Isa 11:1 NJB
“A shoot will spring from the stock of Jesse, a new shoot will grow from his roots.”
**Psalm 40:8, 9 NWT
"To do your will, O my God, is my [Jesus'] delight, And your law is deep within me [Jesus']. 9 I proclaim the good news of righteousness in the great congregation.. . .