Numbers 32:41

Villages. כַּפְרְנֵיהוֹן, their villages.

And [he] called them Chavos Yair. Because he had no children, he called them by his name, as a memorial.

And Jair bar Menasheh went and subdued their villages, and called them the villages of Jair.

AND JAIR THE SON OF MENASHEH. This man [who was in fact from the tribe of Judah, as will be explained] is [here] traced back by genealogy to his mother’s family [Menasheh], because he took his inheritance together with them [i.e., the children of Menasheh]. And in the Book of Chronicles it says explicitly that he was a son, Verse 22). of Hezron, the son of Perez, the son of Judah, and his mother was the daughter of Machir the son of Menasheh, as it says, And afterward Hezron went in to the daughter of Machir the father of Gilead; whom he took to wife when he was threeescore years old, and she bore him Segub. And Segub begot Jair, who had three and twenty cities in the land of Gilead; and it is [further] written, And Geshur and Aram took the hamlets of Jair from them, Kenath, and the villages thereof, even threescore cities. All these were the sons of Machir the father of Gilead., Verse 23. From this [fact that Kenath is here described as being amongst ‘the hamlets of Jair’] it would appear that Nobach [mentioned here in Verse 42] who conquered Kenath and the villages thereof was a son of Jair, [although it is not mentioned here], and therefore these cities were also called ‘the hamlets of Jair.’ is: “Nobach called it [i.e., Kenath and the villages thereof] by his name” [i.e., by the name of Jair — his father — mentioned in the previous verse]; hence these towns also came to be called ‘the hamlets of Jair,’ as they are described in I Chronicles ibid.
And the meaning of the verse, And Moses gave Gilead unto Machir the son of Menasheh is [not “unto Machir” himself, but unto] his family, for it was his sons who conquered it.. Similarly, And unto Machir I gave Gilead means “unto the Machirites,” for since Machir was an honored man and the chief of all his descendants, therefore his children were called by his name, and in the same way the verses refer to the heads of the tribes in connection with the inheritance [given to their children]: southward it was Ephraim’s, and northward it was Menasheh’s. So also: The land of Tappuah belonged to Menasheh etc., Verse 8. And when Scripture says in the Book of Joshua, And this was the lot for the tribe of Menasheh; for he was the firstborn of Joseph. As for Machir the firstborn of Menasheh, the father of Gilead, because he was a man of war, therefore he had Gilead and Bashan,, Verse 1. it also refers to his sons, who were men of war, for it was they who went to Gilead and conquered it, and therefore Moses gave them a great part of these lands. Perhaps Machir was still alive [at the time of the division of the Land in the days of Joshua], for the decree [against the generation] of the wilderness [resulting from the incident of the spies, that they were to die in the desert] had not been decreed upon him, as he was not amongst those counted by Moses and Aaron, being he was more than sixty years old [at the time of the first census after the exodus], and he enjoyed longevity as did the earlier generations.