This was the allotment for the tribe of Manasseh as Joseph’s firstborn, that is, for Makir, Manasseh’s firstborn. Makir was the ancestor of the Gileadites, who had received Gilead and Bashan because the Makirites were great soldiers.
References for Joshua 17:1
So this allotment was for the rest of the people of Manasseh—the clans of Abiezer, Helek, Asriel, Shechem, Hepher and Shemida. These are the other male descendants of Manasseh son of Joseph by their clans.
References for Joshua 17:2
Now Zelophehad son of Hepher, the son of Gilead, the son of Makir, the son of Manasseh, had no sons but only daughters, whose names were Mahlah, Noah, Hoglah, Milkah and Tirzah.
References for Joshua 17:3
They went to Eleazar the priest, Joshua son of Nun, and the leaders and said, “The LORD commanded Moses to give us an inheritance among our relatives.” So Joshua gave them an inheritance along with the brothers of their father, according to the LORD’s command.
References for Joshua 17:4
Manasseh’s share consisted of ten tracts of land besides Gilead and Bashan east of the Jordan,
References for Joshua 17:5
because the daughters of the tribe of Manasseh received an inheritance among the sons. The land of Gilead belonged to the rest of the descendants of Manasseh.