Matthew Poole and continuators on Numbers 26:29

29 Of the sons of Manasseh: of Machir, the family of the Machirites: and Machir begat Gilead: of Gilead come the family of the Gileadites .

Gilead is here mentioned as Machirs onely son, and therefore some conceive that the family of the Machirites, and of the Gileadites, are one and the same family, onely called by two names, first Machirites, but afterwards Gileadites. Others make them distinct families, because Machir had other children, Gen. 50. 23▪ 1 Chron. 7. 14, 15, 16. which are called by their fathers name, Machirites, whereas the children of his eldest son Gilead are called by his name, Gileadites. But though Machir had other children it seems they and their posterity were extinct at this time, and that Machir alone was left and his posterity, as may be gathered by comparing this and the following verses with Ios. 17. 1, 2, 3. and 1 Chron. 7. 14, 15, 16, 17, 18, 19.

Marginal references: Josh. 17. 1.