The Manassehites: from Machir, the family of the Machirites (now Machir became the father of Gilead); from Gilead, the family of the Gileadites.

So Moses gave Gilead to Machir, son of Manasseh, and he lived there. ¹ 

Our children, our wives, our flocks, and all our livestock will be there in the cities of Gilead,

The descendants of Machir son of Manasseh went to Gilead, took it, and dispossessed the Amorites who were in it.

¹ Now the Reubenites and the Gadites possessed a very large number of cattle. When they saw that the lands of Jazer and Gilead were ideal for cattle, ² 

¹ Then the daughters of Zelophehad son of Hepher, the son of Gilead, the son of Machir, the son of Manasseh of the families of Manasseh, ²  the son Joseph came forward. Now these are the names of his daughters: Mahlah, Noah, Hoglah, Milcah, and Tirzah.

Moses said to them: “If the Gadites and the Reubenites cross the Jordan with you, each one equipped for battle in the Lord’s presence, and you conquer the land, ¹  then you must allot them the territory of Gilead as their possession.

These were the Gileadites: from Iezer, the family of the Iezerites; from Helek, the family of the Helekites;

Then the heads of the family groups ¹  of the Gileadites, the descendant of Machir, the descendant of Manasseh, who were from the Josephite families, approached and spoke before Moses ²  and the leaders who were the heads of the Israelite families. ³ 

Now Jair son of Manasseh went and captured their small towns and named them Havvoth Jair.