‘ But Zelophehad, the son of Hepher, the son of Gilead, the son of Machir, the son of Manasseh, had no sons, but daughters. And these are the names of his daughters, Mahlah, and Noah, Hoglah, Milcah, and Tirzah.'
We note first that in Joshua 17:2 it is made clear that Hepher was not necessarily the direct descendant of Machir, and the connection may be tribal, although it is always possible for there to be two or more bearing the same name. This inheritance of daughters where men had no sons was confirmed by YHWH to Moses at an earlier time when these forthright daughters of Zelophehad had approached Moses about their position (Numbers 27:1-11). But in this case they were required to marry within the tribe so that their inheritance would not pass outside the tribe (Numbers 36). To inherit directly brought tribal responsibility. The names of the daughters are represented elsewhere, but if actual women, princesses of the sub-tribe, had not been directly involved there would have been no reason for inventing an artificial situation. See for Mahlah a family of Manasseh (1 Chronicles 7:18), for Hoglah compare Beth-hoglah (Joshua 15:6), for Tirzah see Joshua 12:24. This merely demonstrates a similar environment with similar names in use.
The whole situation is interesting in bringing out the fact that the subject of dividing the land did not just begin here. It had been under serious consideration for a considerable period of time. Preparatory land surveys had probably already taken place under Moses, and information recorded ready for when the time came.