This is his name whereby he shall be called - From remote antiquity the person here spoken of has been understood to be “the righteous germ,” and this alone is in accordance with the grammar and the sense. Nevertheless, because Jeremiah Jeremiah 33:15-16 applies the name also to Jerusalem, some understand it of Israel.
the Lord OUR RIGHTEOUSNESS - Messiah is here called:
(1) Yahweh, and
(2) our righteousness, because He justifies us by His merits.
Some render, He by whom Yahweh works righteousness. Righteousness is in that case personal holiness, which is the work of the Spirit after justification.