So this allotment was for the rest of the descendants of Manasseh—the clans of Abiezer, Helek, Asriel, Shechem, Hepher, and Shemida. These are the other male descendants of the clans of Manasseh son of Joseph.
Manasseh was itself but one half of the tribe of Joseph, and yet was divided and subdivided. 1. It was divided into two parts, one already settled on the other side Jordan, consisting of those who were the posterity of Machir, Jos 17:1.
Commenting on Joshua 17:1-6
There was also a lot for the rest of the children of Manasseh by their families,.... For such that had no part in Gilead and Bashan on the other side Jordan, even for the other half tribe, whose families are particularly mentioned, as follows: for the children of Abiezer; who is called Jeezer in Num 26:30; and was a son of Gilead, the son of...
There was also [a lot] for the rest of the children of Manasseh by their families; for the children of Abiezer, and for the children of Helek, and for the children of Asriel, and for the children of Shechem, and for the children of Hepher, and for the children of Shemida: these [were] the male children of Manasseh the son of Joseph by their families.