Judges 5:14 (ESV)

14 From Ephraim their root they marched down into the valley, following you, Benjamin, with your kinsmen; from Machir marched down the commanders, and from Zebulun those who bear the lieutenant’s staff;

Machir was the eldest of Manasseh’s sons (Genesis 50:23) and the father of Gilead. Numbers 32:39–40 reports that Machir captured the land of Gilead, which Moses assigned to him.