The Shemidaites, named after their ancestor Shemida. The Hepherites, named after their ancestor Hepher.
The Asrielites, named after their ancestor Asriel. The Shechemites, named after their ancestor Shechem.
(One of Hepher’s descendants, Zelophehad, had no sons, but his daughters’ names were Mahlah, Noah, Hoglah, Milcah, and Tirzah.)
So the allotment on the west side of the Jordan was for the remaining families within the clans of the tribe of Manasseh: Abiezer, Helek, Asriel, Shechem, Hepher, and Shemida. These clans represent the male descendants of Manasseh son of Joseph.