Machir was the name of a region mentioned in the Song of Deborah in Judges 5:14. The Song of Deborah speaks of officers (mechokekim) coming from Machir to join the battle against Sisera.
The region is understood in tradition to be identical to the portion of the land of Gilead given to Machir the son of Mansasseh by Moses (Numbers 32:40, Deuteronomy 3:15).
References
Machir (biblical region) Wikipedia(Text) CC BY-SA