A shepherd, who feeds and protects his sheep, is a metaphor for the ruler, who will provide for and protect the people of Israel. AT: "Yahweh will give him the strength to lead his people" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The person's name is a metonym for person's authority. AT: "and people will honor him because Yahweh his God has given him the authority to rule" (See: [[rc://en/ta/man/translate/figs-metonymy]])